The main bone, the humerus ... Even the way a bird reproduces is related to flight. Instead of carrying the extra weight of developing young inside their bodies, they lay eggs and incubate ...

Paleontologists discover a fossilized bird with its egg still inside from northwestern China ... bird’s skeleton had traces ...

Besides long tails, they evolved a backwards-facing pubic bone, which is also found in modern birds. By becoming reverted, the pubis's weight shifted more toward the animals' tails, making up for ...

There are other meat-eating caterpillars that "do lots of crazy things, but this takes the cake," the study's author said.

The Bearded Vulture's diet consists primarily of bones, with up to 90% of their food source coming from bones ...

Before female birds start to lay eggs, they form a calcium-rich structure called medullary bone on the inside of their leg and other bones; they draw on it during the breeding season to make ...

A recent study of the wrists of modern birds finds that a bone lost from dinosaurs for tens of millions of years reappeared when dinosaurs evolved into birds and took flight. In the four-legged ...

Each bird sports a pair of sharpened bone spurs on its wings ... these birds also possess some interesting anatomy below the surface. Inside their bones and skin are tons of tiny air sacs that ...