Imagine zooming out on a giant family tree that includes every bird you have ever seen. Ostriches sprint across open plains, ...

Researchers have shed new light on the features that enable tree-dwelling mammals to move effectively through their ...

Here's a look at one of the most famous families in American history ...

Survival of the fittest. Nature red in tooth and claw. The common view of natural selection is based solely on the individual: A trait allows an organism to out-compete its rivals and is thus passed ...

Researchers reveal Prototaxites, a giant Devonian fossil, was not a fungus or plant but a unique extinct lineage.