Ashley Poust

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Tyrannosaurus rex spanned all of ancient North America, and about 20,000 lived at once. Roger Harris/Science Photo Library vie Getty Images

How many Tyrannosaurus rex walked the Earth?

Ashley Poust, University of California, Berkeley and Daniel Varajão de Latorre, University of California, Berkeley

Using the incredible wealth of fossil data and a modern ecological theory, researchers estimated population density for the extinct apex predator.

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