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

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

How Big Was the T. Rex Population? Study Estimates That There Were 1.7 Billion of Them Lurking Over Earth Prior to Their Extinction

2.5 Billion T. Rex May Have Roamed Earth

Research Reveals 2.5 Billion T. Rexes Once Inhabited Earth

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

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

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

There were Billions of T-Rex terrorizing Earth

Billions of T.rex dinosaurs roamed North America, study shows

2.5 Billion T. Rex Once Existed

Billions of fearsome T.rex dinosaurs once roamed North America, new study shows, maybe in your backyard – Chico Enterprise-Record

Billions of Tyrannosaurus rexes once roamed earth, study shows

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

Dinosaur Census! Estimated 1.7 Billion T. Rexes Walked the Earth