For decades, scientists argued over whether a collection of small tyrannosaur fossils from the American West were teenage ...

History’s most frightening dinosaur, the Tyrannosaurus rex, came from a long line of pipsqueaks. Scientists have identified a new cousin of the T. rex that reached only the 3-foot height of a ...

T. rex teeth — possibly up to six inches long — were thought by many to be too big not to protrude. In recent years, paleontologists have debunked other stereotypical portrayals of the dinosaur.

The Tyrannosaurus rex seemingly came out of nowhere tens of millions of years ago, with its monstrous teeth and powerful jaws dominating the end of the age of the dinosaurs. How it came to be is ...