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

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

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

One Tyrannosaurus rex seems scary enough. Now picture 2.5 billion of them. That’s how many of the fierce dinosaur king probably roamed Earth over the course of a couple million years, a new study ...

A fossilized partial dinosaur skull originally thought to be from a Tyrannosaurus rex might actually represent a previously unknown species, according to a paper published Thursday in the journal ...

To calculate how the tail propelled the T. rex, the researchers scanned and modeled an adult T. rex specimen at the Naturalis Biodiversity Center in Leiden known as "Trix," pictured here. Rique via ...

BERN, Switzerland (AP) — Nearly 300 Tyrannosaurus rex bones that were dug up from three sites in the United States and assembled into a single skeleton sold at Tuesday at a Switzerland auction for 4.8 ...