Fossils and Pigmentation Research

• • NOTOC**

Fossils and Pigmentation Research

Fossils were once thought to reveal relatively little about the original colors of extinct organisms. Bones, shells, impressions, and mineralized remains preserve anatomy well, but coloration was generally assumed to disappear during decay and fossilization. During the early twenty-first century, however, new microscopic, chemical, and experimental techniques transformed the study of fossil pigmentation. Researchers discovered that pigment-bearing structures and chemical traces can sometimes survive for tens or even hundreds of millions of years.

The emerging field is often called palaeocolour or paleocolor research. It combines paleontology with biology, chemistry, physics, microscopy, spectroscopy, geochemistry, and experimental taphonomy. Rather than simply guessing what extinct animals looked like, scientists can sometimes reconstruct particular colors, patterns, or forms of structural coloration from physical evidence preserved in fossils.

Some of the best-known discoveries involve feathered dinosaurs and early birds, but evidence of ancient coloration has also been recovered from mammals, marine reptiles, pterosaurs, fishes, insects, eggshells, and fossil skin. These discoveries provide information not only about appearance but also about camouflage, communication, courtship, physiology, habitat, predator-prey relationships, and the evolution of feathers and other integumentary structures.

Melanosomes and the Discovery of Fossil Color

A major breakthrough came from the recognition of microscopic structures called melanosomes in fossil feathers. Melanosomes are cellular organelles that contain melanin, a pigment responsible for many black, brown, reddish, and gray colors in living animals.

Early fossil studies demonstrated that microscopic bodies preserved in ancient feathers were often not fossilized bacteria, as had previously been proposed, but pigment-bearing melanosomes. Researchers compared their shapes, sizes, densities, and distributions with melanosomes in living birds and other animals.

Different types and arrangements of melanosomes can be associated with different colors. Elongated melanosomes are often associated with dark eumelanin-rich coloration, while other shapes and distributions may correspond to reddish or brown pigmentation. Ordered layers of melanosomes can also contribute to structural effects such as iridescence.

This approach allowed scientists to move beyond speculative reconstructions. Fossils could sometimes provide direct evidence for color patterns that existed while an animal was alive.

The method produced some of the first evidence-based reconstructions of dinosaur coloration. Studies of Anchiornis, for example, reconstructed a complex plumage containing black, white, gray, and reddish regions. Research on Microraptor indicated glossy, dark, iridescent feathers. Fossil evidence from Archaeopteryx suggested that at least some feathers contained substantial black pigmentation.

These discoveries fundamentally changed artistic and scientific reconstructions of extinct animals. Color could now become a testable paleontological hypothesis rather than merely an artistic choice.

Melanin Chemistry and Molecular Evidence

Melanosome morphology alone does not provide complete certainty. Fossilization can distort microscopic structures, and similar structures may occasionally have different biological origins. For this reason, researchers increasingly use chemical methods to confirm the presence of ancient pigments.

Melanin is chemically resistant and may survive fossilization in altered forms. Studies have identified molecular remnants and chemical signatures consistent with both eumelanin, which commonly produces black or dark brown coloration, and pheomelanin, which is associated with reddish and yellow-brown colors.

Chemical evidence has strengthened interpretations of many fossil melanosomes. Researchers have also identified characteristic associations between melanin and trace elements such as copper, zinc, and sulfur.

Synchrotron X-ray fluorescence and related imaging techniques can map these elements across a fossil. When their distribution corresponds to preserved anatomical structures, the resulting chemical patterns may reveal pigmentation that is difficult or impossible to see with ordinary microscopy.

Chemical imaging has also helped researchers detect traces of reddish pheomelanin in fossil mammals. A well-known example involved a roughly three-million-year-old fossil mouse in which chemical residues associated with pheomelanin were mapped in the preserved fur.

The increasing use of chemistry has led to a general principle in paleocolor research: the strongest color reconstructions rely on several independent forms of evidence rather than on a single microscopic characteristic.

Structural Coloration

Not all biological color is produced directly by pigments. Many animals generate vivid colors through microscopic structures that interact with light. These structural colors include metallic, glossy, iridescent, and some blue or green appearances.

Fossil feathers can occasionally preserve the nanoscale arrangements necessary to infer structural coloration. Ordered melanosome layers have been used to identify probable iridescence in extinct birds and feathered dinosaurs.

The Jurassic dinosaur Caihong juji, for example, preserved melanosome arrangements interpreted as evidence of iridescent feathers. Similar techniques were used to reconstruct glossy iridescence in Microraptor.

Research has also explored non-iridescent structural blue coloration. Because the feathers themselves may become dark during fossilization, scientists sometimes rely on the dimensions and organization of preserved melanosomes and comparisons with living birds to identify feathers that were likely blue.

Structural coloration is also exceptionally well preserved in some fossil insects. Ancient moths, butterflies, beetles, and other insects may preserve microscopic multilayer reflectors, scales, or photonic structures capable of producing metallic or iridescent colors.

Some Eocene moth fossils have retained nanoscale structures that allowed researchers to reconstruct original yellow-green coloration. Jurassic moth scales have likewise provided evidence that sophisticated structural coloration evolved early in the history of Lepidoptera.

Dinosaur Plumage, Skin, and Camouflage

Dinosaurs have become one of the most prominent subjects of fossil color research because exceptionally preserved specimens sometimes retain feathers, skin, scales, or pigment-bearing structures.

Sinosauropteryx preserved evidence of a banded tail, dark facial pigmentation, and countershading. The animal appears to have had a darker upper body and lighter underside, a common camouflage pattern in living animals.

Psittacosaurus also preserved extensive skin pigmentation. Researchers reconstructed countershading across its three-dimensional body and used physical models and simulated lighting conditions to investigate the environment in which such camouflage would have been most effective.

The armored dinosaur Borealopelta preserved extraordinary skin and soft tissues. Chemical and microscopic evidence suggested reddish-brown pigmentation and countershading. This finding was particularly significant because the animal possessed heavy defensive armor, yet apparently still benefited from visual camouflage.

These examples demonstrate that fossil pigmentation can reveal aspects of behavior and ecology. Color patterns can provide clues about habitat, lighting conditions, predator pressure, visual signaling, and interactions between extinct animals.

Color and the Evolution of Feathers

Pigmentation research has also contributed to debates about why feathers evolved.

Feathers perform many functions in living birds, including insulation, flight, waterproofing, camouflage, communication, and courtship display. Fossils show that feathers or feather-like structures existed among dinosaurs and pterosaurs before the appearance of modern birds.

The diversity of fossil melanosomes suggests that complex coloration developed relatively early during feather evolution. In some feathered dinosaurs, elaborate pigmentation and iridescence may have functioned in courtship or species recognition.

Microraptor, Anchiornis, and Caihong provide particularly important examples. Their preserved melanosomes indicate that visually conspicuous plumage existed among early feathered dinosaurs.

Evidence from pterosaurs has further expanded the evolutionary picture. Exceptionally preserved pterosaur fossils contain feather-like structures with different populations of melanosomes. Researchers have interpreted this variation as evidence that early feathered structures could have supported sophisticated color patterning.

These findings suggest that visual signaling may have played an important role in feather evolution alongside insulation and aerodynamics.

Pterosaur Pigmentation

Pterosaurs were flying reptiles rather than dinosaurs, but some exceptionally preserved specimens possess feather-like integumentary structures.

Research on the Brazilian pterosaur Tupandactylus imperator revealed differently shaped melanosomes in different types of feather-like structures. Similar variation occurs in modern birds, where melanosome morphology contributes to different colors and optical effects.

The findings suggest that pterosaurs had substantial biological control over the coloration of their integument. Their head crests and feathers may therefore have formed visually complex displays.

This evidence is important to the wider study of feather origins because it indicates that color-producing feather structures originated deep in evolutionary history and were not unique to birds.

Pigmentation in Fossil Mammals

Fossil mammals and mammal relatives also preserve pigmentation information.

Chemical studies have identified altered melanin in fossil hair and fur, while synchrotron techniques have detected signatures associated with pheomelanin. These techniques make it possible to investigate not only dark pigmentation but potentially reddish coloration as well.

Recent quantitative studies of Mesozoic mammaliaforms compared fossil melanosomes with those of living mammals. Several early mammal relatives appear to have possessed relatively uniform dark gray or brown coats rather than the elaborate stripes, spots, and contrasting patterns found in many modern mammals.

These findings may reflect aspects of early mammalian ecology. Many Mesozoic mammals were small and are thought to have occupied ecological niches in which subdued coloration may have been advantageous.

At the same time, studies of fossil mammals demonstrate an important limitation of paleocolor reconstruction: melanosome shape does not always correlate strongly with visible coloration. The relationship differs among animal groups, meaning that comparisons must be made with appropriate living relatives.

Marine Reptiles, Fishes, and Other Vertebrates

Fossil melanin has been identified in several extinct marine reptiles, including ichthyosaurs, mosasaurs, and turtles.

Some specimens indicate extensive dark pigmentation or countershading. Dark dorsal surfaces and lighter ventral regions may have provided camouflage in marine environments. Extensive melanism has also been proposed to contribute to thermoregulation or protection from ultraviolet radiation.

An exceptionally preserved Jurassic ichthyosaur contained evidence of eumelanin-bearing pigment cells together with preserved skin and soft tissues. Such fossils allow researchers to examine pigmentation alongside anatomy, metabolism, and ecology.

Pigmentation has also been studied in ancient fishes. Fossil melanosomes and preserved soft tissues can reveal body patterning, while pigmentation in very ancient lamprey and hagfish relatives has provided evidence concerning both skin coloration and the early evolution of vertebrate eyes.

These examples show that pigmentation research can illuminate biological systems far beyond external appearance.

Dinosaur Egg Color

Fossil pigmentation is not limited to skin, fur, and feathers.

Researchers have identified the pigments biliverdin and protoporphyrin in fossil dinosaur eggshells. These are the same major pigments responsible for blue-green and reddish-brown colors in the eggs of living birds.

Studies of dinosaur eggs indicate that some non-avian dinosaurs laid blue-green or patterned eggs. Broader surveys suggest that colored eggs evolved among theropod dinosaurs before the origin of modern birds.

Egg coloration could have served several functions, including camouflage, nest recognition, signaling, or protection of embryos from sunlight.

These discoveries provide another example of behavioral traits once considered uniquely avian having deeper dinosaur origins.

Fossil Insects and Ancient Color

Insects provide some of the most spectacular examples of preserved structural coloration.

Exceptionally preserved fossil beetles, moths, butterflies, and other insects sometimes retain microscopic surface structures capable of interacting with light. Unlike pigment molecules, structural colors depend on the precise geometry of these structures.

Multilayer reflectors preserved in Eocene moth wings have enabled reconstruction of original metallic or yellow-green colors. Fossil beetles preserved in amber and sedimentary deposits have also retained blue, black, and metallic coloration.

Experimental studies demonstrate that some dark and light patterns in fossil insects may represent original melanin distributions. Researchers artificially mature modern insect tissues under simulated burial conditions to determine which patterns survive fossilization and how they are altered.

Fossil insects therefore provide an important testing ground for understanding both pigmentation and structural-color preservation.

Experimental Taphonomy

One of the greatest challenges in reconstructing fossil color is determining how fossilization modifies biological pigments.

Taphonomy is the study of what happens to organisms between death and their discovery as fossils. Decay, burial, temperature, pressure, chemical reactions, mineralization, microbial activity, and geological alteration can all transform pigments and pigment-bearing structures.

Laboratory experiments expose modern feathers, skin, melanin, and other tissues to simulated fossilization conditions. These experiments have demonstrated that melanosomes may shrink, change shape, or undergo chemical alteration during burial.

This is important because early paleocolor reconstructions sometimes assumed that fossil melanosomes retained their original dimensions. Experimental results show that correction for fossilization effects may be necessary.

Researchers also investigate how eumelanin and pheomelanin respond to heat and pressure. These studies have helped identify chemical signals that remain diagnostic even after substantial alteration.

Experimental taphonomy therefore provides a bridge between living organisms and fossils, allowing researchers to determine which biological signals are likely to survive deep time.

Melanosomes or Microbes?

An important early controversy concerned the identity of microscopic bodies preserved in fossil feathers.

Some researchers proposed that these structures were fossilized bacteria rather than melanosomes. Because bacteria can form similarly shaped microscopic bodies during decay, morphology alone could sometimes be ambiguous.

Subsequent research used chemical evidence, anatomical distribution, experimental decay studies, and comparisons with living tissues to distinguish pigment organelles from microorganisms.

The accumulated evidence strongly supports the presence of genuine melanosomes in many fossil feathers and skin tissues. Nevertheless, the debate helped establish more rigorous standards for identifying fossil pigments.

Modern studies increasingly require multiple independent forms of evidence before making strong claims about original coloration.

Internal-Organ Melanosomes and Other Sources of Bias

Not every melanosome preserved in a fossil necessarily originated from skin, scales, feathers, or fur.

Living animals contain melanosomes in internal organs, including the eyes, liver, and other tissues. During decay, these melanosomes can become displaced.

Research has shown that internal-organ melanosomes possess characteristic geometries and chemical compositions. Their movement during decomposition can potentially contaminate tissues and create misleading apparent pigmentation patterns.

Paradoxically, the same problem has produced a new research opportunity. Because organ-specific melanosomes differ in shape and chemistry, preserved melanosomes can sometimes help researchers identify soft internal organs that would otherwise be invisible in fossils.

This illustrates how paleocolor research has expanded into the broader reconstruction of soft-tissue anatomy.

Limits and Uncertainty in Paleocolor Reconstruction

Despite major advances, fossil color reconstruction remains subject to substantial uncertainty.

Melanosome shape is not a universal color code. Relationships between melanosome morphology and visible coloration vary among birds, mammals, reptiles, and other animals.

Fossilization can also change melanosome dimensions, destroy pigments, alter chemistry, or move microscopic structures from one tissue to another.

Some colors leave much stronger evidence than others. Melanin-based blacks and browns are generally easier to detect than many carotenoid-based yellows, oranges, or reds. Structural colors may survive only when their microscopic architecture is exceptionally well preserved.

Researchers therefore increasingly use a multi-method framework that combines:

• Microscopic examination of melanosomes and pigment cells
• Chemical analysis of preserved organic material
• Synchrotron X-ray fluorescence and elemental mapping
• Spectroscopy
• Mass spectrometry
• Experimental decay and maturation studies
• Comparisons with living animals
• Statistical analysis of melanosome morphology
• Anatomical and sedimentological context

Reconstructions supported by several independent methods are generally considered more reliable than those based on a single line of evidence.

Pigmentation as Evidence of Ecology and Behavior

The significance of fossil pigmentation extends far beyond determining what extinct animals looked like.

Countershading can indicate camouflage and provide clues about habitat structure and lighting conditions. Stripes and disruptive patterns may reveal predator-prey relationships. Iridescent feathers and colorful crests can provide evidence for courtship, social communication, or species recognition.

Dark pigmentation may have contributed to thermoregulation in some extinct animals. Melanin can also strengthen feathers and protect tissues from ultraviolet radiation.

Egg color provides information about reproduction and nesting behavior. Structural colors in insects can reveal ancient signaling and defensive strategies.

Color is therefore increasingly treated as a functional biological trait rather than merely an aesthetic feature.

From Speculative Reconstructions to Testable Science

For much of the history of paleontology, artists reconstructed the colors of extinct animals largely through imagination and analogy with living species.

The discovery of fossil melanosomes fundamentally changed this situation. Microscopic structures, molecular remnants, trace elements, and preserved nanostructures now allow certain aspects of ancient coloration to be tested scientifically.

This does not mean that complete color reconstructions are always possible. Many fossils preserve no usable pigment evidence, and even exceptionally preserved specimens may reveal only part of an animal's original appearance.

Nevertheless, paleocolor research has transformed the reconstruction of ancient life from a largely speculative exercise into an increasingly evidence-based field.

The combination of fossils, experiments, modern comparative biology, chemistry, and advanced imaging continues to expand the range of colors and biological questions that can be investigated.

Conclusion

Fossil pigmentation research has revealed that color can survive deep time in more forms than once believed. Melanosomes, molecular remnants of melanin, trace metals, structural nanostructures, pigment cells, and eggshell pigments have all provided direct or indirect evidence of ancient coloration.

These techniques have reconstructed black and white plumage, reddish feathers, iridescent dinosaurs, countershaded reptiles, dark mammal fur, colored dinosaur eggs, metallic insects, and patterned fossil skin.

At the same time, research into fossilization has demonstrated that ancient colors must be interpreted cautiously. Heat, pressure, decay, chemical alteration, and movement of pigment-bearing structures can change the evidence preserved in fossils.

The strongest reconstructions therefore combine morphology, chemistry, experimental taphonomy, comparative biology, and geological context.

As analytical technologies improve, fossil pigmentation is becoming an increasingly powerful source of information about evolution, ecology, physiology, communication, camouflage, reproduction, and the appearance of ancient organisms. The study of fossil color is no longer simply about determining what extinct species looked like; it is a tool for understanding how they lived.

• • TOC**

Reviews, Syntheses, and Research Programs

The Colour of Ancient Life

[Source page: University College Cork | Maria McNamara Research Group | UCC | 2026]

Reviews how experiments, microscopy, and chemical analysis are allowing researchers to reconstruct coloration in ancient organisms.

Pigmentation in Fossil Mammals

[Research synthesis | Mammalian paleontology literature | 2015–2025]

Surveys increasingly sophisticated attempts to reconstruct hair and fur coloration from fossil melanosomes and chemically preserved melanin.

Paleocolor Reconstruction: Methods, Evidence, and Uncertainty

[Research synthesis | Paleocolor literature | 2008–2025]

Integrates microscopy, comparative biology, chemistry, spectroscopy, experimental taphonomy, and statistical modeling while emphasizing that confidence varies substantially among fossil color reconstructions.

Research: Unlocking the Color of Fossils

[FOSSIL Project | Florida Museum of Natural History | 2025]

Introduces fossil color research for a broad audience and explains how preserved pigments and microscopic structures provide evidence of ancient appearance.

Fossilization and the Transformation of Melanosome Shape

[Experimental taphonomy literature | 2013–2023]

Explores how heat, pressure, sediment chemistry, and decay change pigment organelles and why these effects must be corrected before inferring fossil colors.

Preservation of Phaeomelanin in Deep Time

[Research synthesis | Nature Communications and related literature | 2023–2020s]

Examines experimental and fossil evidence that reddish-yellow phaeomelanin can survive deep time despite being more chemically difficult to recognize than eumelanin.

Pigmentation in Pterosaurs

[Research synthesis | Pterosaur paleobiology literature | 2019–2022]

Examines chemical and microscopic evidence from pterosaur soft tissues and the debate over whether melanosome form can reliably indicate their original colors.

Recent Advances in Amniote Palaeocolour Reconstruction and a Framework for Future Research

[Various authors | Biological Reviews | 2020]

Reviews the rapidly developing science of reconstructing color in fossil reptiles, birds, and mammals and proposes standards for more reliable future analyses.

Reconstructing Vertebrate Paleocolor

[Jakob Vinther | Annual Review of Earth and Planetary Sciences | 2020]

Surveys the evidence used to infer color in extinct vertebrates and explains how melanosomes, pigments, structural colors, chemistry, and taphonomy can be integrated.

Palaeocolour: A History and State of the Art

[Source: The Evolution of Feathers | Fiann Smithwick and Jakob Vinther | Springer | 2020]

Reviews the history of paleocolor research and the microscopic, chemical, statistical, and taphonomic methods used to reconstruct ancient coloration.

What Color Were Fossil Animals?

[Research news | ScienceDaily | September 2019]

Reviews experimental work showing how fossilization can modify pigments and stresses caution when translating fossil chemistry into precise colors.

What Color Were Fossil Animals?

[Research release | EurekAlert | September 2019]

Summarizes research into the degradation of biological pigments and the reliability of different molecular markers for reconstructing ancient coloration.

Melanosomes: Biogenesis, Properties, and Evolution of an Ancient Organelle

[doi:10.1152/physrev.00059.2017 | Liliana D'Alba and Matthew D. Shawkey | Physiological Reviews | 2019]

Reviews melanosome biology, chemistry, optical properties, evolution, and exceptional fossilization potential.

Palaeontologists Evaluate Fossil Color Reconstruction Methods to Propose New Study Framework

[Source page: Phys.org | University of Hong Kong research coverage | Phys.org | 2019]

Summarizes methodological recommendations designed to increase reliability and transparency in reconstructions of extinct-animal coloration.

How Do Scientists Know What Colors Prehistoric Animals Were?

[Source page: Smithsonian Magazine | Smithsonian science coverage | Smithsonian Magazine | 2019]

Explains how fossil feathers, melanosomes, chemistry, and structural-color evidence allow scientists to constrain the appearance of extinct organisms.

The Top Ten Scientific Discoveries of the Decade

[Source page: Smithsonian Magazine | Smithsonian Magazine | 2019]

Includes the development of evidence-based dinosaur color reconstruction among major scientific advances of the decade.

Internal-Organ Melanosomes and Paleocolor Bias

[Research synthesis | Taphonomy literature | 2018–2020s]

Reviews evidence that melanosomes released from decaying eyes, liver, and other organs can migrate within carcasses and potentially contaminate apparent skin-color signals.

Melanins in Fossil Animals: Is It Possible to Infer Life History Traits from the Coloration of Extinct Species?

[doi:10.3390/ijms19020230 | Juan J. Negro, Clive Finlayson and Ismael Galván | International Journal of Molecular Sciences | 2018]

Critically evaluates attempts to infer ecology and behavior from fossil coloration and emphasizes uncertainties surrounding melanosome shape and pigment chemistry.

Dinosaur Egg Pigmentation

[Research synthesis | Dinosaur reproduction literature | 2017–2020s]

Reviews evidence for biliverdin and protoporphyrin in fossil eggshells and the evolutionary origin of colored and patterned dinosaur eggs.

Fossil Pigments Reveal the True Colors of Dinosaurs

[Science feature | Scientific American | 2017]

Reviews how melanin, melanosomes, chemical signatures, and exceptional soft-tissue preservation are transforming reconstructions of dinosaur appearance.

Dinosaur Countershading and Camouflage

[Research synthesis | Current Biology and related literature | 2016–2020s]

Reviews Psittacosaurus, Sinosauropteryx, and Borealopelta as case studies showing how reconstructed pigmentation can be used to test hypotheses about camouflage.

Fossil Color and Predator-Prey Ecology

[Research synthesis | Functional paleobiology literature | 2016–2020s]

Explores how countershading, stripes, disruptive patterns, and other reconstructed colors can reveal ancient visual environments and predator-prey relationships.

FOSSIL COLOUR: The Taphonomy of Colour in Fossil Insects and Feathers

[Source page: European Commission CORDIS | University College Cork | European Commission | 2014–2016]

Describes a research program using decay, maturation, and fossil analysis to investigate preservation of melanins, carotenoids, pterins, and structural colors.

How We Know the Colors of Prehistoric Animals

[Sarah Jane Alger | Nature Scitable | July 20, 2015]

Provides an accessible overview of melanosomes, fossil feathers, structural coloration, and the scientific reasoning behind prehistoric color reconstruction.

A Guide to the Field of Palaeo Colour

[doi:10.1002/bies.201500018 | Jakob Vinther | BioEssays | 2015]

Reviews the major approaches used to reconstruct fossil coloration, including melanosomes, structural colors, chemistry, and comparative studies of living animals.

Interpreting Melanin-Based Coloration Through Deep Time: A Critical Review

[Johan Lindgren et al. | Proceedings of the Royal Society B | 2015]

Reviews claims about fossil melanin and emphasizes the need to combine morphology, chemistry, experimental taphonomy, and appropriate controls.

Pigmentation in Fossil Marine Reptiles

[Research synthesis | Marine reptile paleontology literature | 2014–2020s]

Reviews melanin evidence from ichthyosaurs, mosasaurs, and fossil turtles and what dark body coloration may reveal about their ecology.

Limits of Melanosome Shape as a Color Proxy

[Research synthesis | Paleocolor methodology literature | 2014–2020s]

Explains why correlations between melanosome geometry and color differ among animals and why fossil color predictions require appropriate modern comparative datasets.

Trace Metals and Fossil Pigmentation

[Research synthesis | Geochemical paleontology literature | 2011–2020s]

Explores associations between copper, zinc, sulfur, and melanin as geochemical proxies that can reveal otherwise invisible pigment distributions.

Structural Color in Fossil Feathers

[Research synthesis | Paleocolor literature | 2009–2020s]

Reviews evidence that ordered nanoscale melanosome arrangements capable of producing gloss and iridescence can survive in exceptionally preserved fossil feathers.

Pigmentation in Fossil Birds

[Research synthesis | Avian paleontology literature | 2008–2020s]

Reviews fossil feathers from Archaeopteryx, penguins, Jehol birds, and other extinct avians that preserve evidence of melanin-based and structural colors.

Fossil Melanosomes Versus Fossil Bacteria

[Research synthesis | Paleocolor methodology literature | 2008–2020s]

Summarizes the long-running debate over whether microscopic bodies in fossil tissues represent pigment organelles or microbes and the evidence now used to distinguish them.

Fossil Feathers as Archives of Pigmentation

[Research synthesis | Feather paleontology literature | 2008–2020s]

Explains why carbonaceous fossil feathers have become one of the most productive sources of evidence for reconstructing the appearance of extinct vertebrates.

Fossil Colour

[Source page: University College Cork | Maria McNamara Research Group | UCC | ongoing project]

Describes research programs studying pigmentary and structural color preservation in fossil insects, feathers, and vertebrate skin.

How Fossil Melanosomes Changed Dinosaur Reconstruction

[Research synthesis | Paleontology literature | 2010s]

Reviews the shift from speculative dinosaur colors toward testable reconstructions based on microscopic pigment organelles preserved in feathers and skin.

Melanin as a Biomarker in Deep Time

[Research synthesis | Paleobiology and geochemistry literature | 2010s–2020s]

Examines the use of molecular fragments, trace metals, and organelle morphology as complementary evidence for identifying fossil melanin.

Eumelanin and Phaeomelanin in the Fossil Record

[Research synthesis | Fossil pigment literature | 2020s]

Reviews methods for separating evidence of black-brown eumelanin from reddish or yellowish phaeomelanin after millions of years of chemical alteration.

Structural Color in Fossil Insects

[Research synthesis | Fossil insect literature | 2010s–2020s]

Examines preservation of multilayer reflectors and other nanoscale optical structures responsible for metallic and iridescent colors in ancient insects.

Pigmentation and Dinosaur Display

[Research synthesis | Dinosaur paleocolor literature | 2010s–2020s]

Examines evidence that colorful feathers, crests, and iridescence may have functioned in species recognition, courtship, or other visual signaling before the origin of modern birds.

Pigmentation and the Evolution of Feathers

[Research synthesis | Evolutionary paleontology literature | 2010s–2020s]

Explores how increasingly diverse melanosomes accompanied changes in feather form and function during the dinosaur-to-bird transition.

Fossil Pigments and Thermoregulation

[Research synthesis | Vertebrate paleobiology literature | 2010s–2020s]

Reviews hypotheses that dark pigmentation in extinct animals sometimes contributed to heat absorption, physiological regulation, or adaptation to aquatic environments.

Fossil Pigments and Ultraviolet Protection

[Research synthesis | Melanin evolution literature | 2010s–2020s]

Examines the possibility that melanin-rich tissues in extinct organisms performed protective physiological functions in addition to producing visible coloration.

Chemical Imaging of Fossil Pigmentation

[Research synthesis | Synchrotron and spectroscopy literature | 2010s–2020s]

Reviews synchrotron X-ray fluorescence, spectroscopy, and elemental mapping techniques used to detect pigment-associated chemical signatures invisible to ordinary microscopy.

Raman Spectroscopy and Fossil Melanin

[Research synthesis | Analytical paleontology literature | 2010s–2020s]

Examines the use and limitations of Raman spectroscopy for recognizing carbon-rich pigment residues and distinguishing melanin from other fossil organic matter.

Mass Spectrometry in Fossil Pigment Research

[Research synthesis | Molecular paleontology literature | 2010s–2020s]

Reviews mass-spectrometric methods used to identify molecular fragments associated with melanin and other organic compounds in exceptionally preserved fossils.

Experimental Fossilization of Pigments

[Research synthesis | Experimental taphonomy literature | 2010s–2020s]

Reviews laboratory simulations designed to determine which pigment molecules and cellular structures survive burial, heating, pressure, and chemical alteration.

Fossil Skin as a Record of Ancient Color

[Research synthesis | Vertebrate integument literature | 2010s–2020s]

Reviews exceptional skin fossils preserving pigment cells, melanosomes, scale patterns, and other features that can reveal coloration beyond feathers.

How to Bring a Dinosaur to Life in Technicolour

[Lisa Hendry | Natural History Museum, London | undated]

Explains the methods paleontologists use to infer dinosaur colors from preserved pigments, microscopic structures, and comparisons with living animals.

Methods, Chemistry, and Taphonomy

Sediment-Encased Pressure-Temperature Maturation Experiments Elucidate the Impact of Diagenesis on Melanin-Based Fossil Color and Its Paleobiological Implications

[Various authors | Paleobiology | 2023]

Simulates burial conditions to determine how sediment, temperature, and pressure change melanin and melanosome characteristics used in fossil color reconstruction.

Taphonomic Experiments Reveal Authentic Molecular Signals for Fossil Melanins and Verify Preservation of Phaeomelanin in Fossils

[doi:10.1038/s41467-023-40570-w | Tiffany S. Slater et al. | Nature Communications | 2023]

Establishes chemical criteria for distinguishing altered eumelanin and phaeomelanin from fossilization products and verifies molecular evidence of phaeomelanin in fossils.

Chemistry of Porphyrins in Fossil Plants and Animals

[doi:10.1039/D0RA10688G | Mariam Tahoun et al. | RSC Advances | 2021]

Reviews fossil porphyrin pigments, including derivatives related to chlorophyll and heme that can remain detectable for immense spans of geological time.

Hierarchical Biota-Level and Taxonomic Controls on the Chemistry of Fossil Melanosomes Revealed Using Synchrotron X-Ray Fluorescence

[doi:10.1038/s41598-020-65868-3 | Valentina Rossi, Samuel M. Webb and Maria E. McNamara | Scientific Reports | 2020]

Shows that sedimentary history strongly influences fossil melanosome chemistry while some biologically meaningful tissue-specific chemical signals can survive.

Anatomy of the Extinct

[Source page: Nature Index | Nature Index | 2020]

Highlights research using the chemistry and geometry of fossil melanosomes to identify internal organs in extinct vertebrates.

Tissue-Specific Geometry and Chemistry of Modern and Fossilized Melanosomes Reveal Internal Anatomy of Extinct Vertebrates

[doi:10.1073/pnas.1820285116 | Valentina Rossi et al. | Proceedings of the National Academy of Sciences | 2019]

Demonstrates that melanosomes from different internal organs possess characteristic shapes and chemistries that can help reconstruct fossil soft-tissue anatomy.

In a First, Researchers Identify Reddish Coloring in an Ancient Fossil

[Source page: ScienceDaily | SLAC National Accelerator Laboratory research coverage | ScienceDaily | 2019]

Reports chemical imaging capable of distinguishing fossil residues associated with red pigmentation from those of dark eumelanin.

Fossil Melanosome Chemistry Unlocks Anatomy of Extinct Vertebrates

[Source page: University College Cork | University College Cork | 2019]

Describes how distinct chemical signatures of melanosomes from internal organs can reveal soft-tissue anatomy in fossil vertebrates.

Experimental Analysis of Soft-Tissue Fossilization: Opening the Black Box

[doi:10.1111/pala.12360 | Mark A. Purnell et al. | Palaeontology | 2018]

Provides an experimental framework for separating decay, maturation, mineralization, and preservation processes important to interpreting fossil pigments.

UCC Palaeontologists Make New Discovery on Colours of Dinosaurs

[Source page: University College Cork | University College Cork | 2018]

Reports findings showing that internal-organ melanosomes can enter fossil soft tissues and potentially complicate color reconstruction.

Fossilization of Melanosomes via Sulfurization

[Various authors | Palaeontology | 2016]

Investigates chemical pathways through which melanin-rich organelles may become stabilized during fossilization and survive deep geological time.

True Colors: Using Molecular Analysis to Clarify Dino Color Claims

[Research news | ScienceDaily | October 5, 2015]

Discusses calls for molecular confirmation of fossil melanin rather than relying solely on the shape of microscopic structures.

True Colors: Using Molecular Analysis to Clarify Dino Color Claims

[Research coverage | Phys.org | October 2015]

Explains why chemical evidence, microscopy, and experimental fossilization should be combined before assigning precise colors to extinct organisms.

Pigment from Fossils Identified, Revealing Color of Extinct Animals

[Research news | ScienceDaily | September 2015]

Describes evidence that chemically altered melanin survives in fossils and can help researchers distinguish pigment structures from microbes.

Chemical, Experimental, and Morphological Evidence for Diagenetically Altered Melanin in Exceptionally Preserved Fossils

[Various authors | Proceedings of the National Academy of Sciences | 2015]

Demonstrates how fossilization modifies melanin chemistry and morphology while leaving recognizable signatures that can still be detected in ancient tissues.

Melanosomes and Ancient Coloration Re-Examined: A Response to Vinther 2015

[Mary H. Schweitzer, Johan Lindgren, Alison E. Moyer | BioEssays | 2015]

Discusses disagreements over how confidently fossil microbodies can be identified as melanosomes and argues for multiple independent lines of evidence.

New Research Revises Conventions for Deciphering Color in Dinosaurs While Suggesting Connection Between Color and Physiology

[Jackson School of Geosciences | February 12, 2014]

Explains research showing that the relationship between melanosome form and color evolved through time and should not always be interpreted with a single modern calibration.

Is This Dinosaur Painted Correctly?

[Ed Yong | National Geographic | March 27, 2013]

Examines experimental evidence that fossilization can distort melanosome dimensions and therefore complicate exact dinosaur color reconstruction.

Impact of Diagenesis and Maturation on the Survival of Eumelanin in the Fossil Record

[doi:10.1016/j.orggeochem.2013.09.002 | Keely Glass et al. | Organic Geochemistry | 2013]

Experimentally investigates how burial-related temperature and chemical alteration affect eumelanin and its recognizable molecular signatures.

Revealing Fossil Color

[Source page: Phys.org | University of Bristol research coverage | Phys.org | 2013]

Discusses laboratory experiments showing how heat and pressure alter melanosomes and therefore influence reconstructed fossil colors.

Direct Chemical Evidence for Eumelanin Pigment from the Jurassic Period

[doi:10.1073/pnas.1118448109 | Katie Glass et al. | Proceedings of the National Academy of Sciences | 2012]

Provides chemical evidence that melanin can survive for more than 150 million years and supports interpretations of microscopic fossil structures as genuine melanosomes.

Molecular Preservation of the Pigment Melanin in Fossil Melanosomes

[Johan Lindgren et al. | Nature Communications | 2012]

Uses chemical analyses to demonstrate molecular remnants of melanin in fossilized melanosomes, strengthening the chemical foundation of paleocolor research.

Trace Metals as Biomarkers for Eumelanin Pigment in the Fossil Record

[doi:10.1126/science.1205748 | Roy A. Wogelius et al. | Science | 2011]

Shows that trace-metal distributions associated with melanin can provide an independent geochemical method for detecting pigmentation in fossils.

Feathered Dinosaurs, Fossil Birds, and Plumage

Bio-Molecular Analyses Enable New Insights into the Taphonomy of Feathers

[Various authors | PNAS Nexus | 2024]

Applies molecular methods to feather fossilization and improves understanding of which biological components and pigment signals are most likely to survive.

Taphonomic Experiments Resolve Controls on the Preservation of Melanosomes and Keratinous Tissues in Feathers

[Tiffany S. Slater et al. | Palaeontology | 2020]

Uses controlled decay and maturation experiments to clarify why melanosomes often survive fossilization while surrounding feather tissues are altered or lost.

Evidence Corroborates Identity of Isolated Fossil Feather as a Wing Covert of Archaeopteryx

[Ryan Carney et al. | Scientific Reports | 2020]

Reassesses the isolated Archaeopteryx feather and its pigmentation, morphology, and anatomical position, supporting its identification as a wing covert.

Melanosome Diversity and Convergence in the Evolution of Iridescent Avian Feathers: Implications for Paleocolor Reconstruction

[Various authors | Evolution | 2019]

Examines the diversity of melanosome forms involved in living bird iridescence and assesses how confidently similar structures can be interpreted in fossils.

Characterization of Melanosomes Involved in the Production of Non-Iridescent Structural Feather Colours and Their Detection in the Fossil Record

[Various authors | Royal Society Open Science | 2019]

Investigates melanosomes associated with non-iridescent structural colors and considers whether their morphology can reveal additional fossil feather colors.

Blue Colour Tones in Fossilised Prehistoric Feathers

[Source page: University of Bristol | University of Bristol | 2019]

Reports methods for distinguishing melanosomes associated with blue structural coloration from those producing several melanin-based colors.

World's Oldest Blue Bird Found via Fossil Feathers

[Source page: National Geographic | Michael Greshko | National Geographic | 2019]

Discusses evidence that the Eocene bird Eocoracias brachyptera probably possessed substantial blue plumage.

Signs of the Color Blue Have Been Found in a Fossil for the First Time

[Source page: Science News | Carolyn Gramling | Science News | 2019]

Explains how melanosome morphology and comparisons with living birds were used to infer structural blue in a fossil bird.

Blue Color Tones in Fossilized Prehistoric Feathers

[Source page: ScienceDaily | University of Bristol | ScienceDaily | 2019]

Summarizes research using melanosome dimensions to identify fossil feathers potentially associated with blue structural coloration.

Blue Color Tones in Fossilized Prehistoric Feathers — Phys.org

[Source page: Phys.org | University of Bristol | Phys.org | 2019]

Reviews the reconstruction of blue coloration in Eocoracias and the difficulty of distinguishing blue from gray using fossil melanosomes.

Blue Colour Tones in Fossilised Prehistoric Feathers — Research Coverage

[Source page: Mirage News | University of Bristol research coverage | Mirage News | 2019]

Describes fossil pigment evidence and the relationship between melanosomes and non-iridescent structural blues.

A Bony-Crested Jurassic Dinosaur with Evidence of Iridescent Plumage Highlights Complexity in Early Paravian Evolution

[Dongyu Hu et al. | Nature Communications | 2018]

Describes Caihong juji and finds melanosome arrangements consistent with iridescent plumage, suggesting elaborate visual signaling evolved early among paravian dinosaurs.

Tiny Dinosaur May Have Dazzled Mates with Rainbow Ruff and a Bony Crest

[Source page: Jackson School of Geosciences | University of Texas at Austin | 2018]

Reports melanosome evidence indicating that Caihong juji possessed iridescent feathers associated with its head and neck.

'Rainbow' Dinosaur Had Iridescent Feathers Like a Hummingbird

[Source page: EurekAlert | Field Museum research coverage | 2018]

Describes the discovery of Caihong juji and fossil structures consistent with shimmering iridescent plumage.

New 'Rainbow' Dinosaur May Have Sparkled Like a Hummingbird

[Source page: National Geographic | National Geographic | 2018]

Explains how unusually shaped fossil melanosomes suggested bright iridescence in a Jurassic paravian dinosaur.

This Newly Discovered Dino-Bird Sported Flashy, Iridescent Feathers

[Source page: Audubon | Asher Elbein | Audubon | 2018]

Discusses Caihong and the evolutionary history of visually conspicuous plumage in feathered dinosaurs.

New Dinosaur Species with Colorful Feathers Discovered in China

[Source page: Xinhua | Xinhua | 2018]

Reports discovery of Caihong juji and evidence that some Jurassic dinosaurs carried complex ornamental coloration.

Fossil of 'Rainbow' Dinosaur with Iridescent Feathers and Velociraptor-Like Skull Found in China

[Source page: ABC News | ABC News | 2018]

Covers fossil evidence for iridescent plumage in Caihong and its significance for early feather evolution.

The Plumage and Colouration of an Enantiornithine Bird from the Early Cretaceous of China

[doi:10.1111/pala.12270 | Jennifer A. Peteya et al. | Palaeontology | 2017]

Examines exceptionally preserved feathers and melanosomes in an Early Cretaceous bird to reconstruct aspects of its plumage appearance.

Fossil Melanosomes or Bacteria? A Wealth of Findings Favours Melanosomes

[Jakob Vinther | BioEssays | 2016]

Reviews morphological and chemical evidence supporting the interpretation of pigment-bearing microbodies in many fossil feathers as genuine melanosomes.

Molecular Evidence of Keratin and Melanosomes in Feathers of the Early Cretaceous Bird Eoconfuciusornis

[Various authors | Proceedings of the National Academy of Sciences | 2016]

Reports molecular and microscopic evidence supporting preservation of both pigment-associated melanosomes and components related to feather keratin.

A New Ornithurine from the Early Cretaceous of China Sheds Light on the Evolution of Early Ecological and Cranial Diversity in Birds

[doi:10.7717/peerj.1765 | Jiandong Huang et al. | PeerJ | 2016]

Describes Changzuiornis ahgmi and its preserved feathers, including microscopic structures relevant to interpreting pigmentation in early ornithurine birds.

Molecular Composition and Ultrastructure of Jurassic Paravian Feathers

[Johan Lindgren et al. | Scientific Reports | 2015]

Investigates preserved feather tissues from Jurassic paravians and considers the survival of melanin, keratin-related compounds, and ultrastructural features.

Pigments, Organelles Persist in Fossil Feathers

[Source page: ScienceDaily | Brown University research coverage | ScienceDaily | 2015]

Reports chemical evidence that melanin and associated pigment organelles can persist after extensive fossilization.

Feathered Dinosaur Colors Bloomed 150 Million Years Ago

[Dan Vergano | National Geographic | February 2014]

Covers research on melanosome diversification in feathered dinosaurs and the possible relationship between coloration and physiological evolution.

Melanosomes or Microbes: Testing an Alternative Hypothesis for the Origin of Microbodies in Fossil Feathers

[Various authors | Scientific Reports | 2014]

Tests whether microscopic bodies identified as fossil melanosomes could instead be fossil bacteria and discusses criteria needed to distinguish the alternatives.

Melanosome Evolution Indicates a Key Physiological Shift Within Feathered Dinosaurs

[Quanguo Li et al. | Nature | 2014]

Compares melanosome diversity across fossil and living animals and links expanded melanosome variation with changes in feather function, physiology, and signaling.

Experimental Maturation of Feathers: Implications for Reconstructions of Fossil Feather Colour

[doi:10.1098/rsbl.2013.0184 | Maria E. McNamara et al. | Biology Letters | 2013]

Subjects modern feathers to simulated burial conditions and shows that heat and pressure can alter melanosome dimensions, potentially affecting fossil color estimates.

Synchrotron-Based Chemical Imaging Reveals Plumage Patterns in a 150 Million Year Old Early Bird

[Various authors | Journal of Analytical Atomic Spectrometry | 2013]

Applies synchrotron chemical imaging to Archaeopteryx material and demonstrates how elemental distributions can complement microscopic evidence of pigmentation.

Flying Dinosaur Had Black Feathers: Study

[AFP | ABC Science | January 25, 2012]

Summarizes research reconstructing an Archaeopteryx feather as black based on fossil melanosome morphology.

Archaeopteryx Wore Black

[Susan Milius | Science News | January 24, 2012]

Discusses melanosome evidence indicating that the famous isolated Archaeopteryx feather had predominantly black pigmentation.

Winged Dinosaur Archaeopteryx Dressed for Flight

[Brown University | January 24, 2012]

Explains how the black pigmentation inferred for an Archaeopteryx feather may also have strengthened feather structure for flight.

New Evidence on the Colour and Nature of the Isolated Archaeopteryx Feather

[doi:10.1038/ncomms1642 | Ryan Carney et al. | Nature Communications | 2012]

Examines the famous isolated Archaeopteryx feather and concludes from melanosome morphology that much of the feather was originally black.

Reconstruction of Microraptor and the Evolution of Iridescent Plumage

[doi:10.1126/science.1213780 | Quanguo Li et al. | Science | 2012]

Reconstructs Microraptor as having glossy, iridescent dark plumage and explores the possible role of feather coloration in display and communication.

Feathered Dinosaur Had Black Wings?

[Ker Than | National Geographic | January 2012]

Reports evidence for dark Archaeopteryx feathers and examines possible links between melanin, coloration, and feather durability.

Four-Winged Dinosaur's Feathers Were Black, Iridescent

[American Museum of Natural History | 2012]

Describes the Microraptor reconstruction and explains evidence for glossy, iridescent plumage in the small four-winged dinosaur.

Microraptor Was a Glossy Dinosaur

[Science coverage | Smithsonian Magazine | 2012]

Reviews evidence that Microraptor possessed dark iridescent feathers and considers the possible signaling function of its plumage.

Iridescent, Feathered Dinosaur Offers Fresh Evidence That Feathers Evolved to Attract Mates

[Source page: Jackson School of Geosciences | University of Texas at Austin | 2012]

Reports the reconstruction of glossy black, iridescent plumage in Microraptor and discusses its potential display function.

Four-Winged Dinosaur's Feathers Were Black with Iridescent Sheen

[Source page: EurekAlert | American Museum of Natural History | 2012]

Explains microscopic evidence that Microraptor's plumage produced a glossy iridescent appearance.

Microraptor's True Blue Colors

[Source page: Science News | Devin Powell | Science News | 2012]

Covers the identification of iridescent feather structures in Microraptor and their implications for dinosaur signaling.

Iridescent, Feathered Dinosaur: New Evidence That Feathers Evolved to Attract Mates

[Source page: EurekAlert | National Science Foundation research coverage | 2012]

Discusses the hypothesis that ornamental display helped shape early feather evolution before advanced flight.

Four-Winged Microraptor Had Iridescent Black Plumage, Suggests Feathers Developed for Display

[Source page: Audubon | Anna Sanders | Audubon | 2012]

Reviews evidence for dark iridescent Microraptor feathers and the possibility that they functioned in courtship or communication.

Fancy Feathers of Old

[Source page: The Irish Times | Claire O'Connell | The Irish Times | 2012]

Reports research reconstructing iridescence in feathered dinosaurs and examines what coloration can reveal about feather function.

Microraptor Suggests Feathers Evolved to Attract Mates

[Source page: UT News | Christopher Palmer | University of Texas at Austin | 2012]

Discusses Microraptor's reconstructed iridescence as evidence for a visual-display role in early feather evolution.

Morphological and Geochemical Evidence of Eumelanin Preservation in the Feathers of the Early Cretaceous Bird Gansus yumenensis

[Various authors | PLOS ONE | 2011]

Combines microscopic and chemical evidence to argue that melanin-derived structures and compounds survived in the feathers of the Early Cretaceous bird Gansus.

Alabama's Wealth of Fossil Dinosaur Feathers

[Source page: National Geographic | Brian Switek | National Geographic | 2011]

Discusses fossil feather preservation and the possibility of recovering pigmentation information from Cretaceous material in North America.

Yale Scientists First to Reveal Flamboyant Colors of a Dinosaur's Feathers

[Quanguo Li and colleagues | Yale News | February 4, 2010]

Reports the Anchiornis color reconstruction and describes a patterned dinosaur with black-and-white limb feathers and reddish coloration on the head.

Scientists Complete Color Palette of a Dinosaur for the First Time

[Yale research coverage | Phys.org | February 4, 2010]

Summarizes the whole-body Anchiornis color study and its implications for understanding plumage evolution and display.

Yale Scientists Complete Color Palette of a Dinosaur for the First Time

[Yale University | EurekAlert | February 4, 2010]

Reports research mapping melanosome distributions across Anchiornis and reconstructing distinct plumage regions.

Dinosaur Had Vibrant Colors, Microscopic Fossil Clues Reveal

[Research news | ScienceDaily | February 2010]

Summarizes evidence that fossil melanosomes can reveal multiple colors and detailed plumage patterning in feathered dinosaurs.

Paint By Number Dinos: Paleontologists Reveal Dinosaurs' True Colors

[University of Texas at Austin | Jackson School of Geosciences | February 2010]

Explains how statistical comparisons between fossil and modern melanosomes enabled researchers to reconstruct dinosaur plumage colors.

What Colours Were Dinosaur Feathers?

[Ed Yong | National Geographic | January 27, 2010]

Explains the scientific basis for reconstructing dinosaur feather colors from the size, shape, and distribution of fossil melanosomes.

Dinosaurs, in Living Color

[Sid Perkins | Science News | January 27, 2010]

Reports how preserved melanosomes allowed researchers to infer color patterns in feathered dinosaurs and early birds.

Fossilized Melanosomes and the Colour of Cretaceous Dinosaurs and Birds

[doi:10.1038/nature08740 | Fucheng Zhang et al. | Nature | 2010]

Identifies fossilized melanosomes in dinosaurs and early birds from the Jehol Biota and shows how their shapes can reveal aspects of original plumage coloration.

Plumage Color Patterns of an Extinct Dinosaur

[doi:10.1126/science.1186290 | Quanguo Li et al. | Science | 2010]

Reconstructs much of the plumage pattern of Anchiornis, including gray, black, white, and rufous regions, using quantitative comparisons of fossil and modern melanosomes.

Fossil Evidence for Evolution of the Shape and Color of Penguin Feathers

[doi:10.1126/science.1193604 | Julia A. Clarke et al. | Science | 2010]

Examines an exceptionally preserved fossil penguin and uses melanosome morphology to investigate the evolution of penguin feather coloration.

Dinosaur True Colors Revealed for First Time by Feather Study

[Science news | National Geographic | January 2010]

Covers one of the first studies to infer specific feather colors in non-avian dinosaurs from fossilized melanosomes.

True-Color Dinosaur Revealed: First Full-Body Rendering

[Science news | National Geographic | 2010]

Describes the reconstruction of Anchiornis as one of the first attempts to map color over most of a dinosaur's plumage.

Dinosaurs, Now in Living Color

[Science coverage | Smithsonian Magazine | 2010]

Reviews discoveries that transformed dinosaur restorations by replacing speculative colors with evidence derived from fossil feathers.

Structural Coloration in a Fossil Feather

[doi:10.1098/rsbl.2009.0524 | Jakob Vinther et al. | Biology Letters | 2009]

Uses preserved melanosome arrangements in an Eocene feather to infer iridescent structural coloration, expanding fossil color reconstruction beyond simple black and brown pigmentation.

Fossil Birds & Dinosaurs in Technicolor

[University of Texas at Austin researchers | Jackson School of Geosciences | 2009]

Describes emerging techniques for using fossil melanosomes to reconstruct feather colors in extinct birds and dinosaurs.

Fossil Feathers Preserve Evidence of Color, Say Yale Scientists

[Jakob Vinther and colleagues | Yale News | July 8, 2008]

Reports early research showing that microscopic pigment structures preserved in fossil feathers can provide direct evidence of original color patterns.

Fossil Feathers Preserve Evidence of Color

[Yale research coverage | Phys.org | July 2008]

Explains the discovery that fossil feather microstructures previously interpreted as bacteria were more consistent with pigment-bearing melanosomes.

The Colour of Fossil Feathers

[doi:10.1098/rsbl.2008.0302 | Jakob Vinther, Derek E. G. Briggs, Richard O. Prum, Vinodkumar Saranathan | Biology Letters | 2008]

Demonstrates that microscopic bodies preserved in fossil feathers are melanosomes and that their distribution can preserve evidence of original dark and light feather patterns.

Dinosaur Skin, Camouflage, and Integument

Fossilized Melanosomes Reveal Colour Patterning of a Sauropod Dinosaur

[doi:10.1098/rsos.251232 | Tess Gallagher et al. | Royal Society Open Science | 2025]

Reports potential melanosomes in sauropod epidermal scales and presents evidence for previously unknown color patterning in this major dinosaur group.

The Top Ten Dinosaur Discoveries of 2025, From Preserved Blood Vessels to the Return of a Short King

[Science feature | Smithsonian Magazine | 2025]

Includes new evidence for sauropod pigmentation among notable dinosaur discoveries, illustrating the continuing expansion of fossil color research to previously unknown groups.

Cellular Structure of Dinosaur Scales Reveals Retention of Reptile-Type Skin During the Evolutionary Transition to Feathers

[doi:10.1038/s41467-024-48400-3 | Zixiao Yang et al. | Nature Communications | 2024]

Examines fossil dinosaur epidermal tissues at cellular scale and provides new context for interpreting integument and pigment-bearing structures.

Researchers Discover Hidden Step in Dinosaur Feather Evolution

[Source page: University College Cork | University College Cork | 2024]

Reports cellular-scale evidence from fossil dinosaur skin that helps trace the transition from reptilian scales toward feather-bearing avian skin.

A Dinosaur 'Belly Button'? This 130-Million-Year-Old Fossil Reveals That—and More

[Science feature | National Geographic | 2023]

Examines the extraordinary soft-tissue preservation of Psittacosaurus, including skin structures and pigmentation patterns important for reconstructing its appearance.

The Exquisitely Preserved Integument of Psittacosaurus and the Scaly Skin of Ceratopsian Dinosaurs

[Various authors | Communications Biology | 2022]

Examines exceptional Psittacosaurus skin preservation and provides new information about scales, integumentary anatomy, and the interpretation of dinosaur appearance.

The Colors of Dinosaurs Open a New Window to Study the Past

[Science feature | Smithsonian Magazine | 2019]

Explores how dinosaur color reconstructions are being used not only to visualize extinct animals but also to study camouflage, signaling, physiology, and habitat.

New Sources of Melanin Pigment Shake Up Ideas About Fossil Animals' Colour

[University of Bristol | July 23, 2018]

Reports evidence that internal organs contain abundant melanosomes, highlighting the risk of mistaking displaced internal pigments for skin or feather color.

Non-Integumentary Melanosomes Can Bias Reconstructions of the Colours of Fossil Vertebrates

[Maria E. McNamara et al. | Nature Communications | 2018]

Shows that melanosomes occur abundantly in internal organs as well as skin and feathers, warning that displaced internal melanosomes can confuse color reconstructions.

Fossilized Skin Reveals Coevolution with Feathers and Metabolism in Feathered Dinosaurs and Early Birds

[doi:10.1038/s41467-018-04443-x | Maria E. McNamara et al. | Nature Communications | 2018]

Describes cellular-scale preservation of dinosaur and early-bird skin associated with fossil feathers and explores the evolution of integumentary physiology.

New Paper in Nature Communications on Fossil Colour

[Source page: University College Cork | Maria McNamara Research Group | UCC | 2018]

Summarizes research warning that not every fossil melanosome necessarily originated in pigment-bearing skin or feathers.

Shedding Light on Dinosaur Dandruff

[Source page: Nature Index | Nature Index | 2018]

Highlights fossil skin flakes associated with dinosaur feathers and their significance for reconstructing ancient integument.

Oldest Known Case of Dandruff Found in 125m-Year-Old Dinosaur

[Source page: The Guardian | Ian Sample | The Guardian | 2018]

Reports cellular preservation of shed dinosaur epidermis discovered alongside feathers in Early Cretaceous fossils.

Did Dinosaurs Get Dandruff?

[Source page: The Guardian | Hanneke Meijer | The Guardian | 2018]

Explores how microscopic skin preservation helps scientists understand dinosaur integument and the biology surrounding fossil feathers.

Fossilized Skin Reveals Coevolution with Feathers and Metabolism in Feathered Dinosaurs and Early Birds — Research Highlight

[Source page: Nature Index | Nature Index | 2018]

Summarizes nanoscale preservation of dinosaur skin cells and how integument evolved alongside feathers.

It's Official: Stunning Fossil Is a New Dinosaur Species

[Michael Greshko | National Geographic | August 3, 2017]

Discusses Borealopelta's extraordinary three-dimensional preservation, including chemical evidence used to reconstruct reddish coloration and countershading.

An Exceptionally Preserved Three-Dimensional Armored Dinosaur Reveals Insights into Coloration and Cretaceous Predator-Prey Dynamics

[doi:10.1016/j.cub.2017.06.071 | Caleb M. Brown et al. | Current Biology | 2017]

Reconstructs Borealopelta as reddish-brown with countershading and argues that camouflage remained useful even for a heavily armored dinosaur.

Countershading and Stripes in the Theropod Dinosaur Sinosauropteryx Reveal Heterogeneous Habitats in the Early Cretaceous Jehol Biota

[doi:10.1016/j.cub.2017.09.032 | Fiann Smithwick et al. | Current Biology | 2017]

Reconstructs a striped tail and countershaded body in Sinosauropteryx and uses the pattern to infer aspects of the animal's visual environment and habitat.

'Bandit-Masked' Feathered Dinosaur Hid from Predators Using Multiple Types of Camouflage

[Source page: University of Bristol | University of Bristol | 2017]

Describes Sinosauropteryx coloration, including a dark eye mask, striped tail, and countershading.

In the Age of the Dinosaur Size Really Didn't Matter When It Came to Dinner

[Source page: University of Bristol | University of Bristol | 2017]

Discusses Borealopelta's reddish pigmentation and countershading as evidence that even heavily armored dinosaurs benefited from camouflage.

What Dinosaurs' Color Patterns Say About Their Habitat

[Research news | ScienceDaily | September 2016]

Describes how reconstructed countershading in Psittacosaurus was modeled under different lighting conditions to infer its likely environment.

Dinosaur Camo

[National Geographic Education | September 2016]

Explains the evidence for dinosaur countershading and how camouflage patterns can provide clues to ancient habitats and predator-prey interactions.

3D Camouflage in an Ornithischian Dinosaur

[Jakob Vinther et al. | Current Biology | 2016]

Reconstructs countershading in Psittacosaurus and uses three-dimensional models to test how its pigmentation pattern may have functioned as camouflage.

This Dinosaur Wore Camouflage

[Science coverage | National Geographic | 2016]

Reports the reconstruction of Psittacosaurus countershading and explains how body coloration can reveal possible habitat and predator-avoidance strategies.

'Parrot Lizard' Dinosaur's Camouflage Recreated from Preserved Skin

[Source page: ABC News Australia | Jonathan Hepburn | ABC News | 2016]

Reports reconstruction of Psittacosaurus countershading from exceptionally preserved pigment patterns.

What Dinosaurs' Color Patterns Say About Their Lives

[Source page: EurekAlert | Cell Press research coverage | 2016]

Explores how experimentally modeled Psittacosaurus coloration can provide evidence concerning habitat and camouflage.

The Integument of Psittacosaurus from Liaoning Province, China: Taphonomy, Epidermal Patterns and Color of a Ceratopsian Dinosaur

[Various authors | Naturwissenschaften | 2010]

Examines exceptionally preserved Psittacosaurus integument and discusses skin structure, pigmentation patterns, and the processes responsible for its preservation.

Sinosauropteryx

[Natural History Museum, London | Dinosaur Directory | undated]

Reviews evidence for a reddish-brown and white banded tail and countershading in Sinosauropteryx based on fossilized pigment structures.

Dinosaur Egg Pigmentation

The Great Speckled Dinosaur Egg

[James Gorman | The New York Times / research-news archive | October 31, 2018]

Covers evidence that dinosaur eggs could be blue, green, spotted, or otherwise patterned and that egg coloration originated before modern birds.

Dinosaur Egg Colour Had a Single Evolutionary Origin

[Jasmina Wiemann et al. | Nature | 2018]

Surveys eggshell pigments across dinosaurs and argues that colored eggs originated among theropod dinosaurs before being inherited by modern birds.

Dinosaurs Had Colored Eggs, New Study Shows

[Source page: American Museum of Natural History | AMNH | 2018]

Reports chemical evidence that dinosaur eggs included blue-green and spotted coloration long before the diversification of modern birds.

Thank the Dinosaurs for This Colorful Bird Trait

[Source page: The Washington Post | Ben Guarino | The Washington Post | 2018]

Discusses evidence that colored eggshells originated among non-avian dinosaurs rather than independently in modern bird groups.

Dinosaur Origin of Egg Color: Oviraptors Laid Blue-Green Eggs

[Jasmina Wiemann et al. | PeerJ | 2017]

Detects the pigments biliverdin and protoporphyrin in fossil dinosaur eggshells and supports the existence of blue-green coloration in some non-avian dinosaur eggs.

Pterosaurs

Pterosaur Melanosomes Support Signalling Functions for Early Feathers

[Various authors | Nature | 2022]

Reports diverse melanosome geometries in pterosaur soft tissues and argues that early feather-like structures may already have supported visual signaling.

Pterosaur Discovery Solves Ancient Feather Mystery

[Source page: Phys.org | University College Cork | 2022]

Reports differently shaped melanosomes in distinct pterosaur feather types, suggesting sophisticated control of feather coloration.

Pterosaurs May Have Had Coloured Feathers Similar to Birds

[Source page: Natural History Museum | Natural History Museum, London | 2022]

Explains how a Tupandactylus fossil provides evidence for both branched feathers and color-controlling melanosomes.

Pterosaurs May Have Had Vibrant Feathers Like Modern Birds

[Source page: Smithsonian Magazine | Elizabeth Gamillo | Smithsonian Magazine | 2022]

Discusses evidence that pterosaurs possessed the biological machinery required to produce patterned and potentially vivid feather coloration.

Early Feathers Revealed in Fossil of Flying Dinosaur-Era Reptile

[Source page: The National | Paul Peachey | The National | 2022]

Reports exceptional preservation of pterosaur feathers and pigment-bearing organelles from a Brazilian fossil.

Pterosaurs May Have Had Brightly Colored Feathers, Exquisite Fossil Reveals

[Source page: Scientific American | Riley Black | Scientific American | 2022]

Examines the implications of pterosaur melanosomes for the evolutionary origins of feathers, pigmentation, and visual signaling.

Pterosaurs May Have Had Brightly Colored Feathers on Their Heads

[Source page: Science News | Carolyn Gramling | Science News | 2022]

Describes varied melanosome geometries in Tupandactylus headcrest feathers and what they suggest about coloration.

How a New Discovery Solves Ancient Mystery About Flying Reptiles

[Source page: RTÉ Brainstorm | RTÉ | 2022]

Explains evidence from pterosaur feathers suggesting that color control developed very early in feather evolution.

Pterosaurs Already Had Coloured Feathers

[Source page: Royal Belgian Institute of Natural Sciences | Institute of Natural Sciences | 2022]

Reports microscopic evidence for distinct melanosome populations in the feather-like structures of Tupandactylus.

Mystery Solved: Pterosaurs Had Colorful Feathers

[Source page: Earth.com | Zach Fitzner | Earth.com | 2022]

Summarizes research indicating that pterosaurs could vary the coloration of different feather types.

Irish-Led Pterosaur Research Solves Ancient Feather Mystery

[Source page: The Irish Times | Shauna Bowers | The Irish Times | 2022]

Covers research led by Irish paleontologists showing complex pigmentation biology in pterosaurs.

Pterosaurs Had Brightly Colored Feathers Like Toucans, According to a New Study

[Source page: Salon | Matthew Rozsa | Salon | 2022]

Discusses the fossil evidence for color-producing melanosomes in pterosaur feathers and comparisons with modern birds.

NEW! Paper in Nature

[Source page: University College Cork | Maria McNamara Research Group | UCC | 2022]

Introduces the Nature study on Tupandactylus melanosomes and the role of coloration in the earliest feathered structures.

Pterosaur Discovery Solves Ancient Feather Mystery — ScienceDaily

[Source page: ScienceDaily | University College Cork | ScienceDaily | 2022]

Reports evidence that pterosaurs controlled feather coloration through variation in melanosome shape, much as birds do today.

Pterosaurs Were Covered with Colorful Feathers, Study Says

[Source page: CNN | CNN Science | 2022]

Covers evidence that pterosaurs possessed branched feathers and mechanisms for producing differing feather colors.

Pterosaur Discovery Solves Ancient Feather Mystery — Brighter Side of News

[Source page: The Brighter Side of News | Eoin Hahessy / University College Cork | 2022]

Summarizes research into pigment organelles preserved in the feathered crest of Tupandactylus imperator.

Chemical Characterization of Pterosaur Melanin Challenges Color Inferences in Extinct Animals

[Various authors | Scientific Reports | 2019]

Uses chemical analysis of pterosaur tissues to question simple correlations between fossil melanosome shape and original color.

Fossil Mammals

Fur Colour of Ancient Mammal Relatives Revealed for the First Time

[James Ashworth | Natural History Museum, London | March 13, 2025]

Reports a quantitative study of fossil mammaliaform melanosomes indicating that several Mesozoic species had predominantly dark gray-brown fur.

Mesozoic Mammals Had Uniform Dark Fur

[Science research release | EurekAlert | March 13, 2025]

Summarizes evidence that early mammaliaforms lacked much of the striking pelage patterning seen in many living mammals.

Early Mammals Had Dark and Dusky Grayish-Brown Fur, Study Suggests

[Paleontology news | Sci.News | March 13, 2025]

Reports research indicating relatively uniform dark coloration among several Mesozoic mammaliaforms and discusses possible implications for nocturnal lifestyles.

First Mammals Show Their True Colors and It's All Dark

[Naturalis Biodiversity Center / Nature Today | March 2025]

Describes comparative analysis of fossil and living mammal melanosomes that reconstructed Mesozoic mammal relatives with dark, subdued coats.

Mesozoic Mammaliaforms Illuminate the Origins of Pelage Coloration

[doi:10.1126/science.ads9734 | Ruoshuang Li et al. | Science | 2025]

Compares fossil and living mammal melanosomes and reconstructs six Mesozoic mammaliaforms as having relatively dark, subdued fur coloration.

High Melanosome Diversity Exhibits Weak Correlation with Color and Environmental Variables in the Early Evolution of Therian Mammals

[doi:10.1126/sciadv.adw8707 | Xin Li et al. | Science Advances | 2025]

Uses fossil and living mammal datasets to test how reliably melanosome morphology predicts fur coloration and ecological variables.

Pheomelanin Pigment Remnants Mapped in Fossils of an Extinct Mammal

[doi:10.1038/s41467-019-10087-2 | Phillip L. Manning et al. | Nature Communications | 2019]

Uses synchrotron X-ray imaging to identify chemical residues associated with reddish pheomelanin in three-million-year-old fossil mouse fur.

Three Million Year Old Fossilised Mouse Reveals Evolutionary Secrets of Colour

[Source page: University of Manchester | University of Manchester | 2019]

Reports synchrotron evidence for chemical traces of reddish pheomelanin in fossil mouse fur.

Signs of Red Pigment Were Spotted in a Fossil for the First Time

[Source page: Science News | Carolyn Gramling | Science News | 2019]

Explains how sulfur and zinc distributions provided evidence of reddish pheomelanin in a three-million-year-old fossil mammal.

Scientists Determine Colour of Ancient Mammals

[University of Bristol | September 2015]

Reports chemical and microscopic work showing how melanin remnants can be identified in fossil mammals and used cautiously to reconstruct coloration.

Other Fossil Vertebrates

A Fish Frozen in Time: Ancient Fossil Reveals Colour, Last Meal, and a Parasitic Hitchhiker

[Source page: CSIRO | CSIRO | 2025]

Describes an exceptionally preserved fossil fish whose soft tissues provide clues to original body coloration as well as diet and parasitism.

Skin Patterning and Internal Anatomy in a Fossil Moonfish from the Eocene Bolca Lagerstätte Illuminate the Ecology of Ancient Reef Fish Communities

[Various authors | Palaeontology | 2022]

Uses preserved melanosomes and soft tissues to reconstruct aspects of the external patterning of an Eocene reef fish and its ecological significance.

Soft-Tissue Evidence for Homeothermy and Crypsis in a Jurassic Ichthyosaur

[doi:10.1038/s41586-018-0775-x | Johan Lindgren et al. | Nature | 2018]

Finds eumelanin-containing melanophores and countershading in an exceptionally preserved ichthyosaur while also documenting skin and blubber.

Attenborough and the Sea Dragon

[Source page: Geological Society Blog | Fiann Smithwick | Geological Society of London | 2018]

Describes examination of fossil ichthyosaur skin and melanosomes used to infer dark dorsal coloration and a lighter underside.

Fossil Snake Colours Revealed

[Research news | Nature | April 2016]

Reports the preservation of pigment-related cellular structures in fossil snake skin that permitted reconstruction of a more complex palette than melanin alone could provide.

Reconstructing Carotenoid-Based and Structural Coloration in Fossil Skin

[Maria E. McNamara et al. | Current Biology | 2016]

Uses exceptionally preserved fossil snake skin to show that cellular structures associated with multiple pigment types may preserve evidence of colors beyond melanin.

Pigmented Anatomy in Carboniferous Cyclostomes and the Evolution of the Vertebrate Eye

[doi:10.1098/rspb.2016.1151 | Sarah E. Gabbott et al. | Proceedings of the Royal Society B | 2016]

Identifies melanosomes and melanin in approximately 300-million-year-old lamprey and hagfish relatives, including evidence of skin pigmentation and sophisticated eyes.

Ancient Pigments Reveal the Evolutionary History of Our Own Eyes

[Source page: The Guardian | Sarah Gabbott | The Guardian | 2016]

Explains how pigment-bearing melanosomes in Carboniferous lamprey and hagfish fossils illuminate early vertebrate vision and skin coloration.

Bacteria or Melanosomes? A Geochemical Analysis of Micro-Bodies on a Tadpole from the Oligocene Enspel Formation of Germany

[doi:10.1007/s12549-014-0177-5 | Holly E. Barden et al. | Palaeobiodiversity and Palaeoenvironments | 2015]

Tests whether microscopic bodies associated with exceptionally preserved fossil tissues represent pigment-bearing melanosomes or fossilized microorganisms.

Skin Pigmentation Provides Evidence of Convergent Melanism in Extinct Marine Reptiles

[Johan Lindgren et al. | Nature | 2014]

Finds evidence for dark melanin-rich skin in several distantly related fossil marine reptiles and explores possible roles in camouflage, thermoregulation, and UV protection.

Fossil Pigments Reveal the Colors of Ancient Sea Monsters

[Research news | ScienceDaily | January 2014]

Reports the discovery of preserved melanin in ichthyosaurs, mosasaurs, and fossil turtles and the inference that some had extensively dark skin.

Fossil Pigments Reveal the Colors of Ancient Sea Monsters

[Lund University research coverage | EurekAlert | January 2014]

Describes evidence for melanism in several unrelated marine reptiles and explores possible adaptive benefits of dark pigmentation.

Convergent Evolution in Aquatic Tetrapods: Insights from an Exceptional Fossil Mosasaur

[doi:10.1371/journal.pone.0011998 | Johan Lindgren et al. | PLOS ONE | 2010]

Examines exceptional mosasaur soft-tissue preservation that helped establish how fossilized integument can illuminate the appearance of extinct marine reptiles.

Fossil Insects and Structural Color

The Origins of Colour Patterns in Fossil Insects Revealed by Maturation Experiments

[doi:10.1098/rspb.2023.1333 | Shengyu Wang et al. | Proceedings of the Royal Society B | 2023]

Uses artificial maturation experiments to show that many monochromatic patterns in fossil insects plausibly derive from original melanin-based pigmentation.

The Origin of Colour Patterns in Fossil Insects

[Source page: University College Cork | Maria McNamara Research Group | UCC | 2023]

Describes experimental research showing how differential preservation of melanin-rich cuticle can retain ancient insect color patterns.

New Paper Published in Proceedings B on Insect Colour Patterns

[Source page: University College Cork | Maria McNamara Research Group | UCC | 2023]

Introduces research testing the origin of dark and light patterns observed in exceptionally preserved fossil insects.

Preservation and Taphonomy of Fossil Insects from the Earliest Eocene of Denmark

[doi:10.3390/biology11030395 | Miriam Heingård et al. | Biology | 2022]

Uses microscopy and molecular techniques to investigate exceptional insect preservation, including cuticle, melanin, and structural-color-related features.

Structural Colours in Diverse Mesozoic Insects

[Various authors | Proceedings of the Royal Society B | 2020]

Documents preserved photonic structures and metallic colors in fossil insects, showing that structural coloration has a substantial deep-time record.

New Cretaceous Soldier Beetle (Cantharidae) from Burmese Amber with Preserved Coloration on the Elytra

[doi:10.11646/zootaxa.4609.3.13 | Sieghard Ellenberger and Fabrizio Fanti | Zootaxa | 2019]

Describes a Cretaceous amber beetle whose wing covers retain striking black-blue metallic coloration interpreted as potentially aposematic.

Fossil Scales Illuminate the Early Evolution of Lepidopterans and Structural Colors

[doi:10.1126/sciadv.1700988 | Qingqing Zhang et al. | Science Advances | 2018]

Examines Jurassic moth scales whose nanoscale architecture could scatter visible light, providing very early evidence for structural coloration in Lepidoptera.

Fossil Study Sheds Light on Ancient Butterfly Wing Colors

[Source page: ScienceDaily | University of Exeter research coverage | ScienceDaily | 2018]

Reports fossil-scale research indicating that structural coloration appeared very early in the evolutionary history of moths and butterflies.

Ancient Clues on Butterfly Hues

[Source page: Nature Index | Nature Index | Nature Index | 2018]

Highlights evidence that Jurassic moth scales produced structural colors by scattering light from microscopic surface architecture.

The Taphonomy of Colour in Fossil Insects and Feathers

[doi:10.1111/pala.12044 | Maria E. McNamara | Palaeontology | 2013]

Reviews the processes that preserve, alter, or destroy biological color during fossilization and identifies major cautions for reconstructing ancient appearance.

The Original Colours of Fossil Beetles

[Maria E. McNamara et al. | Proceedings of the Royal Society B | 2012]

Tests how fossilization alters structurally colored beetle cuticle and examines how original metallic and iridescent colors can be reconstructed.

Fossilized Biophotonic Nanostructures Reveal the Original Colors of 47-Million-Year-Old Moths

[doi:10.1371/journal.pbio.1001200 | Maria E. McNamara et al. | PLOS Biology | 2011]

Reconstructs yellow-green coloration in Eocene moths from preserved multilayer reflectors and investigates the defensive functions of their structural colors.

Moth Fossils Show Their Colours

[doi:10.1038/479449b | Nature Research Highlights | Nature | 2011]

Reports research reconstructing the original structural colors of Eocene fossil moths from nanoscale wing structures.

Fossil Moths Show Their True Colors

[Source page: Phys.org | PLOS / research coverage | Phys.org | 2011]

Explains how fossilized photonic structures allowed researchers to reconstruct the original yellow-green coloration of ancient moth wings.