For decades, a small tyrannosaur skull has divided paleontologists over whether it belonged to a separate species or a ...

Was Nanotyrannus a bona fide species or just a teenage Tyrannosaurus rex with a lot more growing to do? Scientists have settled that debate.

For decades, paleontologists argued over the lone skull used to establish the distinct species Nanotyrannus. Was it truly a ...

A controversial dinosaur fossil previously believed to be a juvenile Tyrannosaurus rex is in fact a different species altogether — the Nanotyrannus — a new study suggests. The research has up-ended ...

Tyrannosaurus rex roamed the Earth up to 68 million years ago, but paleontologists for about a century had no clues as to where this massive and iconic animal came from. That changed when a jawbone ...