After decades of fierce debate, researchers say fossils once thought to be juvenile T. rex actually belong to a separate, ...

A new specimen of one of the most controversial species of dinosaur has the potential to overturn decades of research on the ...

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

For decades, paleontologists debated whether fossils were of a young T. rex or a species called nanotyrannus. A new study ...

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

There are literally decades of research... based on a premise that this article overturns,” said one paleontologist.

The new species is called Nanotyrannus. Compared to the well known tyrannosaurus rex, a nanotyrannus was more speedy and ...

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