“Tyrannosaurus rex was big, Tyrannosaurus rex was vicious, and Tyrannosaurus rex had tiny arms.” In this PBS Eons episode, Hank Green explains how the Tyrannosaurus rex lost its arms over the course of 90 million years. He also discusses a few ideas about how this gigantic carnivore of the Cretaceous period might have used its relatively tiny two-fingered forelimbs.
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