Tyrannosaur Fossil Indicates Dinosaur Got Smart First, Then Grew Big

March 14, 2016 7:13 PM

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Tyrannosaur Fossil Indicates Dinosaur Got Smart First, Then Grew Big

At the end of the dinosaur age, Tyrannosaurus rex was a behemoth killer animal, up to 40 feet long and weighing several tons — the top carnivore in the food chain.

The very first tyrannosaurs, which arose about 100 million years earlier, were small, about the size of a person.

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