Debate kicked off in 1988 when a single small tyrannosaur skull discovered four decades earlier was given its own species name: Nanotyrannus lancensis. It carried some features which differed from T.

How did these different dinosaur species interact? Did they hunt different prey? What did T. rex adolescence really look like ...

T. rex's story has been turned on its head by a new discovery about one of the world's most famous fossil finds. One of the ...

Specifically, whether or not certain fossils found in Montana belonged to a young Tyrannosaurus rex or a completely separate, ...

At the twilight of the age of dinosaurs, an agile and vicious predator named Nanotyrannus prowled western North America, resembling a smaller version of Tyrannosaurus - about a tenth the body mass - ...

ROCKFORD, Ill. (WIFR) - A famous dinosaur fossil housed at a Rockford museum for more than two decades has been reclassified ...