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 ...

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 ...

In 1983, archaeologists excavated Kruger Cave in South Africa and found a 7,000-year-old femur bone that belonged to an ...