Tyrannosaurus rex may have been a cannibal. A young Yale University scientist, Nicholas Longrich, reports finding tooth marks on the feet and arms of four different T. rex fossils -- marks that ...

More than 85 million years ago, a smaller-bodied ancestor of the Tyrannosaurus rex roamed the plains of Mongolia. The dinosaur's identity was unknown — until now. In a study published Wednesday ...

A newly discovered dinosaur from Mongolia, named Khankhuuluu mongoliensis, or "Dragon Prince," is believed to be a crucial ancestor of the Tyrannosaurus rex (T rex), shedding light on the T rex's ...