A dinosaur dubbed one of the "strangest" ever found boasted an elaborate armory of long bony spikes and a tail weapon, ...

Massive dinosaurs came in many different forms, but they all had the same problem: Staying cool. Now, fossilized traces of blood vessels in the skulls of big-bodied dinosaurs reveal how different ...

A fossil found in Argentina shows that up to the very end of the age of dinosaurs, they faced serious competition from other ...