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

T. Rex Wasn't All Brawn. It Had a Brain Comparable to a Primate

About 2.5 Billion T. Rex Dinosaurs Stomped Across The Earth's Surface, Study Finds

Tiny Ancestor of T. Rex Discovered

There Were Billions of T-rexes, and 9 Other Things You Never Knew About Dinosaurs

Tyrannosaurs may have hunted together in packs like wolves

There Were Billions of T-rexes, and 9 Other Things You Never Knew About Dinosaurs

Total T. Rex Population During Species' Existence Was 2.5 Billion

The Maximum Number Of T. Rex To Ever Walk The Earth Was 1.7 Billion

How many T. rex were there? Billions, it turns out

2.5 billion Tyrannosaurus rex roamed the Earth though not all at once

In All of Time, 2.5 Billion Tyrannosaurus Rexes Have Roamed Earth, Smart News

T. rex skull fossil from South Dakota to be auctioned in NY for millions

Tyrannosaurs may have hunted in packs like wolves, new research has found, Dinosaurs