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Megalodons, which went extinct 3.6 million years ago, are believed to have grown to lengths of 50 feet.

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Robert Eagle for NBC Right Now — Megalodon was a truly vicious killer, but not a cold-blooded one

UCLA Assistant Professor of Atmospheric and Oceanic Sciences Robert Eagle discusses megaladon’s extinction and how studying it can be helpful towards understanding modern ocean ecosystems for NBC Right Now. “Studying the driving factors behind the extinction of a highly successful predatory shark like megalodon can provide insight into the vulnerability of large marine predators in modern ocean ecosystems experiencing the effects of ongoing climate change.”