The team measured the wing and leg bones of 111 bat species and 149 bird species from around the world. Their dataset included X-rays of museum specimens and about a third of the new X-rays of bat ...

When vertebrates moved onto land, long ago, some of them eventually became airborne, way after the insects did. There are ...

"We already knew from past genetic analysis that the two groups are becoming different species, so we wanted to ... Although it’s not uncommon for birds to communicate with each other by flapping ...

This bird made hawk-watching famous ... Dark morph: adult has an all-dark body with dark wing coverts and silvery flight feathers, the dark tail has a wide white band. The juvenile is dark ...

Birds are vertebrate animals adapted for flight. Many can also run, jump, swim, and dive. Some, like penguins, have lost the ability to fly but retained their wings. Birds are found worldwide and ...