Megalodon sharks may have become megapredators by running hot
Warmer-than-seawater body temperature may have helped the ancient sharks swim fast and snag prey
Otodus megalodon (center in this illustration, preying on a seal) was warmer-blooded than the great white shark (top left). That warm-bloodedness may have helped it grow so large, but also ultimately spelled its doom as food sources dwindled.
Alex Boersma/PNAS