Birds are warm-blooded animals with feathers, wings, and a beak or bill. They lay eggs and are the only animals with feathers. Birds also have a light skeleton, with hollow bones that make it ...
The genes that caused scales to become feathers in the early ancestors of birds have been found by US scientists. By expressing these genes in embryo alligator skin, the researchers caused the ...
From scales to feathers to fur, vertebrates clothe themselves ... Then University of Geneva biologist Michel Milinkovitch visited an Italian animal fair, found scaleless, “naked” bearded ...