Feathers are among the most complex cutaneous appendages in the animal kingdom. While their evolutionary origin has been ...

Cranial kinesis allows modern birds to eat a wider variety of foods and use their beaks as multifunctional tools.

At the 12th day of incubation, feather buds exhibit longitudinal domains of cell density that correspond to the barbs of the future down feather.

Scientists uncovered a key genetic pathway in the origin of feathers, but they found that evolution is stubborn in turning ...