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 with his students to find an answer.
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Paleontologists Stunning Conclusion: 2.5 Billion T. Rexes Roamed North America Over the Cretaceous Period
Here's how scientists calculated how many T. Rexes lived on Earth
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A total of some 2.5 billion T. rex roamed the Earth, study finds
Billions' of Tyrannosaurus rexes said to have walked the Earth in all of history - National
1.7 Billion T. Rexes Lived on Earth. Where Are All the Bones?
New Study Reveals About 2.5 Billion T-Rex Walked The Earth Over A Couple Million Years! - Science
Almost 2 Billion T. Rexes Once Stomped the Earth