Turtles use hand signals for a number of reasons. This turtle is laying a smackdown, and it could be aggression or flirtation ...

Lowering of the iguana’s dewlap (its skin flap beneath its chin). More signs of aggression or danger may include: Hissing.

An illustration shows what Duonychus tsogtbaatari might have looked like. Unlike its therizinosaur brethren, the new species ...

Paleontologists in southern Brazil have unearthed the fossilized remains of an ancient reptile with long, scimitar-like claws and a beak. The reptilian creature, named Venetoraptor gassenae by ...

A new dinosaur species has been discovered in Mongolia’s Gobi Desert based on two “exquisitely preserved” long fossil claws, an advance that sheds more light on a less understood family of the giant ...