The Origin of Hair, Scales and Feathers
This is what the science tell's us:
Keratins are the main constituent of structures that grow from the skin: the α-keratins in the hair, horns, nails, claws and hooves of mammals
Keratins are the main constituent of structures that grow from the skin: the α-keratins in the hair, horns, nails, claws and hooves of mammals