Study: About 2.5 billion T. Rex roamed Earth but not at once

A model of a monstrous, bone-crushing Tyrannosaurus rex sits on display in the main room of the New Mexico Museum of Natural History and Science in Albuquerque, N.M., on Tuesday, Aug. 15, 2017. Museum curator of paleontology Thomas Williamson discovered the fossil remains of a T. rex relative in northwestern New Mexico in 1996 and worked with researchers at Los Alamos National Laboratory last fall to scan the skull in hopes of gleaning new information about the evolution of the predators. (AP Photo/Susan Montoya Bryan)

A new study concludes that 2.5 billion Tyrannosaurus rex prowled North America. Thursday’s study said they didn’t all roam Earth at once.

That’s over a couple million years or so. And at any one moment, maybe 20,000 or so were alive.

The study figures out the T. rex population based on its size, how much it had to eat and its sexual maturity. It’s a first-of-its-kind estimate, though it comes with a huge margin of error. Scientists say if there were much fewer T. rex, we may never have known they existed.

Only about 100 or so T. rex fossils have been found.

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