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

Billions of T. rex dinosaurs existed on Earth, scientists reveal

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

One of the Most Complete T. Rex Skulls Ever Found May Fetch $20 Million at a Single-Lot Sale at Sotheby's

Billions' of Tyrannosaurus rexes said to have walked the Earth in all of history - National

Teen angst? T-Rex, other large dinosaurs out-competed smaller rival species, study finds-Tech News , Firstpost

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

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

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

How many 'Tyrannosaurus rex' walked the Earth?

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

Paleontologists Stunning Conclusion: 2.5 Billion T. Rexes Roamed North America Over the Cretaceous Period

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

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

Billions of T. rexes walked on North America during the Age of the Dinosaurs

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