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
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Tyrannosaurus rex, Jurassic Park Wiki
Study: 2.5 billion T. rex roamed Earth, but not all at once
Multitudes of Tyrannosaurus rex in Cretaceous North America – Earth-logs
How many T. rexes were there? Billions., rex
How many T. rexes were there? Billions.
Billions of Tyrannosaurus rexes once roamed earth, study shows