To withstand the force of the oncoming air, a flight feather is shaped asymmetrically, the leading edge thin and stiff, the trailing edge long and flexible. To generate lift, a bird has merely to ...

When you whistle, the tone is produced by air whistling through a constriction. The tail chirp is produced by vibration of ...

Tail feathers are multipurpose tools ... and secondary feathers associated with this wing shape make slow gliding easier. Learn about 6 bird beak types and how birds use them to eat.

The wings, for example, are shaped to create lift ... or breastbone. The tail feathers are used for steering. Birds have a unique digestive system that allows them to eat when they can—usually ...

The evolution of feathers with an asymmetrical shape, like those of Archaeopteryx, further enhanced the flight capabilities of early birds. After Archaeopteryx, the fossil record suggests that ...

Just inside the doorway of the Northwestern University Library you will find a glass case that contains a first edition set of John James Audubon’s Birds of America ... extent of its dark glossy body ...