Palaeontologists have argued for decades over whether certain fossils are young Tyrannosaurus rex or another species entirely ...

Now a research team said there’s new evidence that resolves the case. The latest clue comes from a complete skeleton — first ...

Paleontologists have long debated whether small tyrannosaurs were their own species or simply teenage T. rexes. This debate ...

An argument over whether fossils from several small dinosaurs represent a juvenile Tyrannosaurus rex or smaller adults of a ...

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

A new look at the "Dueling Dinosaurs" fossil reveals that Tyrannosaurus rex was not the only tyrannosaur roaming the land.

Two paleontologists think they have settled a long-standing debate as to whether certain fossils from the very end of the ...