15 août 20000000 av. J.-C. - Fur

Description:

Fur likely first appeared in pre-mammalian synapsids (like cynodonts) before true mammals evolved. By the Jurassic, mammals had fully developed fur, aiding in their survival during the dinosaur-dominated Mesozoic.

Whisker Fossils in Cynodonts – Fossils of early mammal relatives (cynodonts) show skull features associated with whiskers, implying the presence of hair.
Jurassic Fossils with Fur Impressions – Some early mammals from the Jurassic (e.g., Castorocauda, Volaticotherium) have preserved fur imprints, confirming that true mammals had already developed hair by this time.
Genetic Evidence – Modern mammals share key genes responsible for hair growth, indicating an ancient origin of fur

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