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Skin-Deep Evolutionary Link

How reptiles got their scales.

RELATED TAGS: EVOLUTION
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When University of Geneva biologist Michel Milinkovitch started studying naked bearded dragons, he just wanted to know why the lizards didn’t have scales — he never expected to solve a major evolutionary puzzle. Biologists have long debated whether reptile scales, bird feathers and mammal hair evolved from the same body part on the animals’ distant shared ancestor. But it seemed unlikely, because the body coverings were thought to grow differently: Feathers and hair develop ...
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