How many T. rexes were there? Billions.

Over approximately 2.5 million years, North America likely hosted 2.5 billion Tyrannosaurus rexes, a minuscule proportion of which have been dug up and studied by paleontologists, according to a UC Berkeley study. (Image by Julius Csotonyi , courtesy

1.7 Billion T. Rexes Lived on Earth. Where Are All the Bones?

Tiny Ancestor of T. Rex Discovered

Billions of Tyrannosaurus rexes once roamed earth, study shows

Study: 2.5 billion T. rex roamed Earth, but not all at once

Two and a half billion T. rex dinosaurs once lived, study finds

How many T. rexes ever lived? If you think a billion, go higher

An estimated 2.5 billion Tyrannosaurus rexes lived and died on Earth •

Book Review: The Unleashing of Tyrannosaurus Rex

That's a lot of teeth': 2.5 billion T rex walked the earth, researchers find, Dinosaurs