At the 12th day of incubation, feather buds exhibit longitudinal domains of cell density that correspond to the barbs of the future down feather ... into feathers on the bird’s feet.

The couple returns every year to prepare their nest, lay their clutch and care for their eaglets, according to Great Lakes ...

The animal’s entire body was preserved in three dimensions, from the bird’s eyelids to the tips of its wings. Ergo: A feather fossil that is preserved down to the microscopic pigment ...

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 ...