Gail Singer | Washington, D.C. Birds can be seen sleeping while perched on a branch, standing on one foot or clinging to bark. Some even sleep while flying. Studies show that birds can let one ...

Some birds sleep briefly with a half-awake brain, while others spend long cold nights in torpor, and some can sleep while flying. Here's what Pasquier had to say about his incredibly interesting ...

The Wright Brothers studied bird flight before they designed the first airplane. Now modern aircraft fly higher and faster ...