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American Focus > Blog > Tech and Science > Fossils reveal what the fur of early mammals looked like
Tech and Science

Fossils reveal what the fur of early mammals looked like

Last updated: March 13, 2025 1:34 pm
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Fossils reveal what the fur of early mammals looked like
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Illustration of Arboroharamiya fuscus, a newly discovered Jurassic mammal species with dark fur

Chuang Zhao, Ruoshuang Li

Exploring the world of prehistoric mammals, a recent study has shed light on the coloration of early mammals during the Jurassic and Cretaceous periods. While dinosaurs and pterosaurs displayed vibrant feathers, it seems that early mammals opted for a more conservative approach with their greyish-brown fur.

According to Matthew Shawkey from Ghent University in Belgium, these ancient mammals were likely prey for dinosaurs, hence the need to blend in and avoid being conspicuous.

Advancements in scientific techniques have made it possible to analyze fossilized fur and feathers, revealing details about the coloration of ancient creatures. By studying melanosomes, which are pigment-containing organelles within cells, researchers can make educated guesses about the colors of fur and feathers from the past.

Through a comprehensive analysis of melanosomes in the fur of 116 modern mammals, Shawkey’s team developed a model to predict fur color based on melanosome shape. Applying this model to fossils of six early mammals from China, including the newly identified Arboroharamiya fuscus, researchers discovered a consistent trend of greyish-brown fur.

These mammals, believed to have been nocturnal, exhibited a uniformity in coloration, surprising the researchers with the extent of similarity across different species. This homogeneity in fur color may have been a strategic adaptation for survival in their ancient environments.

Looking ahead, the research team plans to expand their study to include more early mammal fossils from different regions. However, Shawkey anticipates similar results, suggesting that vibrant colors in mammals may have only emerged after the extinction of dinosaurs, allowing for more diversity in daytime activity.

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While some dinosaur and marine reptile fossils have preserved skin, there is still much to uncover about the coloration of these ancient creatures through further research and analysis.

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TAGGED:earlyFossilsFurlookedmammalsreveal
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