Here’s exactly how T. rex grew from a slender tot into a massive carnivore

Tyrannosaurus rex wasn’t born the massive beast known for ripping prey to shreds. A paleontologist has found the beast goes through 21 distinct growth stages as it develops from a wee, slender tot to a full-grown, massive dinosaur king. And the two most important stages on its growth chart occurred when T. rex became a teenager and around its 18th birthday.

The study — the most comprehensive to date focused on T. rex growth — also revealed: The male and female skeletons look exactly alike; the controversial Nanotyrannus is not a separate species; and adult T. rex‘s size and weight are not predictive of its age. 

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