The acclaimed Arizona destination may sometimes have too many attractions for its own good—though its charms remain clear as ...

Two new studies into lizard colors reveal how one species maintains its colorful diversity while others are losing their ...

The oldest fossilized remains of complex animals appear suddenly in the fossil record, and as if from nowhere, in rocks that ...

Tenontosaurus fossils found in West Texas, the southernmost record of the dinosaur and a key to the Early Cretaceous.