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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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Aradhna Tripati for Science Daily — Megalodon was no cold-blooded killer

UCLA professor of Earth, planetary and space sciences Aradhna Tripati discusses new research that supports megaladons were warm-blood creatures. “Having established endothermy in megalodon, the question arises of how frequently it is found in apex marine predators throughout geologic history.”