Most achieve their color through structural coloration, an optical illusion caused by the way light interacts with microscopic structures in their feathers. That said, whether their green is real ...

Birds are vertebrate animals adapted for flight ... The leading edge is thicker than the back edge, and they are covered in feathers that narrow to a point. Airplane wings are modeled after ...

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 ...