Evidence of avian beginnings has been elusive in the fossil record because birds' light, hollow bones rapidly decompose. So far, the oldest-known bird fossil is the famous Archaeopteryx ...

Humans don't have hollow bones like birds do, so how big would our wings have to be to lift us off the ground? When you purchase through links on our site, we may earn an affiliate commission.

You may have heard penguins being referred to as the “birds of the sea,” but unlike most birds, they can’t actually fly.

Birds also have a light skeleton, with hollow bones that make it easier for them ... helps them to move through the water and fins that help them swim. Fish lay eggs in the water and can be ...

The dinosaur's plumage may have been used for mating or other visual displays, similar to how modern birds use their colorful feathers, or to help regulate ... had hollow bones, tended nests ...