Is it a snake or a legless lizard? It's very understandable if you ... both slither along the ground in a roughly S-like fashion, and both eat some of the same things, like mice and bird eggs.

A storeroom specimen that changed the origins of modern lizards by millions of years has had its identity confirmed.

Cottonmouth snakes are venomous reptiles found in the southeastern US. They are known for their white mouth lining.

High-definition 3D reconstructions of whole-brains in the facultative bipedal brown basilisk lizard (Basiliscus vittatus, left panel) and golden flying snake (Chrysopelea ornata, right panel ...