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

Analysis of what's known about the dinosaur leads to conclusion there were 2.5 billion over time. How many Tyrannosaurus rexes roamed North America during the Cretaceous period? That's a question Charles Marshall pestered his paleontologist colleagues with for years until he finally teamed up

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Study finds about 2.5 billion T. Rex roamed Earth but not at once

A total of some 2.5 billion T. rex roamed the Earth, study finds

Paleontologists Uncover One Of The Largest Predators To Roam

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Number of T-rexes that lived in North America could have been in

Newly Discovered Dinosaur Reveals How T. rex Became King of the

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2.5 Billion T. Rex Roamed Earth, but Not All at Once, Study Says

Like Godzilla, but actually real': Study shows T. rex numbered 2.5

Paleontologists discover world's heaviest Tyrannosaurus rex - ABC News