How many 'Tyrannosaurus rex' walked the Earth?

Using the incredible wealth of fossil data and a modern ecological theory, researchers estimated population density for the extinct apex predator.

These dinosaurs had shorter arms than the T. rex

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

How Many Tyrannosaurus Rex Walked the Earth?

The Total Number Of T-Rex That Ever Walked The Earth Is 2.5 Billion

T. Rex Discoveries Reveal How the Dinosaurs Hunted, Walked, and Grew

The Ultimate Guide To Tyrannosaurus Rex - All About T-Rex

Tyrannosaurus Rex Animal Facts Tyrannosaurus rex - A-Z Animals

Where did the T.Rex live, and in what period? - Quora

Tyrannosaurus rex, Prehistoric Planet Wiki

National Geographic Kids™: T. Rex by Andrea Silen (Paperback)

Tyrannosaurus rex and velociraptor may have had lips covering their teeth, new study finds

Billions of T. rex likely roamed the Earth, paleontologists report

Dinosaurs: Billions of T-Rex once roamed the Earth, scientists say

Dinosaur - Tyrannosaurus rex - The Australian Museum