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• How many T. rexes were there? Billions.

How many T. rexes were there? Billions.

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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.

Study finds about 2.5 billion T. Rex roamed Earth but not at once: 'That's a lot of jaws

Are scientists trying to bring back the T-Rex? - Quora

T. Rex Skull Found in South Dakota Expected to Fetch $15-$20M

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

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

That's a lot of teeth': 2.5 billion T rex walked the earth, researchers find, Dinosaurs

How many T. rex ever existed? Calculation of dinosaur's abundance offers an answer

Steve Brusatte, paleontologist: 'The most terrifying thing about the tyrannosaurus was not its jaws but its intelligence', Culture

There were Billions of T-Rex terrorizing Earth

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