Feathers are among the most complex cutaneous ... complete and permanent transformation of scales into feathers on the bird's feet. "Since the Shh pathway plays a crucial role in feather ...

Whether they’re opening for takeoff, spreading wide for a lazy soar or flapping to brake for landing, bird wings make flying look almost effortless.

Ornithologist Carla Dove explains how the microscopic structure of a bird's feather can help identify the species and at the same time, make air travel safer for humans 8 Mind-Boggling Facts About ...