Hair, feathers, scales: Much of a muchness
Kate Lunau has an interesting article in Motherboard. The lede:
Lizard scales and feathers seem like they’re a long way from human hair. But it turns out that fur, feathers, and scales all evolved from one common ancestor, no matter how different these adornments seem: they can all be traced back to a lizardlike creature that roamed the Earth some 310 million years ago. . .