Nanotyrannus lethaeus was a fast, agile predator distinct from T. rex, with longer legs, stronger arms and a body built for ...

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

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

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