Bird Wing Anatomy The average bird wing is a remarkably complicated thing. The bone-and-muscle part is relatively small, and most of the visible surface area is composed only of strong feathers.

It’s called a keel. This structure is located in a bird’s sternum and is connected to the flight muscles that allow most birds to flap their wings and take off.

When a bird flaps its wings downward, it causes it to lift; when it flaps its wings upward, it causes thrust, propelling the bird forward. "Actual bird wings also contain bones," Hassanalian said.

That means they only just clinch the title from wandering albatrosses, who can spend up to 14.5 percent all the way down to just 1.2 percent of their flight time slowly flapping their wings ...

A kakapo is a species in the parrot family. It is the heaviest type of parrot in the world and the only one that cannot fly. The green feathers and rugged appearance are why the parrot is often ...