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

Absolute abundance and preservation rate of Tyrannosaurus rex

Almost 2 Billion T. Rexes Once Stomped the Earth

New Study Reveals Surprising Tyrannosaurus Rex Population and Lifespan

65 Million-Year-Old T-Rex From Wyoming To Be Auctioned, Could Fetch $9 Million

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

Jurassic Park version of T-Rex didn't exist - they actually looked totally different, say scientists

Multitudes of Tyrannosaurus rex in Cretaceous North America – Earth-logs

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

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

How many 'Tyrannosaurus rex' walked the Earth?

The Family Feud Behind a $32 Million T. Rex Named Stan - WSJ