Debate kicked off in 1988 when a single small tyrannosaur skull discovered four decades earlier was given its own species ...

Scientists have unveiled a previously unknown tyrannosaur species that fundamentally changes our understanding of how the mighty Tyrannosaurus rex evolved. The newly identified dinosaur, named ...

An old dinosaur debate gained new traction after a new study's findings suggesting that miniature versions of the famed Tyrannosaurus rex may actually be a distinct species. Researchers from the ...

Fossils paleontologists initially thought belonged to a juvenile Tyrannosaurus rex actually belong to a new species of ...

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 - ...

The iconic Tyrannosaurus rex, or “T. Rex,” might need to be re-categorized into three distinct species, according to researchers. The Tyrannosaurus rex is the only recognized species of the group of ...

For over 50 years a tiny Tyrannosaurus rex has been the subject of a scientific debate. Was it a previously unknown pygmy species—a miniature version of the iconic predator—or was it just a young T.

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 toddler.

Researchers say they have uncovered a case of mistaken identity and found evidence of a species called Nanotyrannus lancensis.

Tyrannosaurus rex, the king of the dinosaurs, has gained a new family member. The fragments of a fossilized skull belonging to a previously unknown species of tyrannosaur were found in southern ...