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On the other hand, being endothermic could have also contributed to megalodon's extinction, since constantly regulating body temperature like this would have expended more energy and thus required more food.

"Cold-blooded animals often shut down their metabolism entirely during a tough season, but many endothermic or 'warm-blooded' animals that hibernate frequently reactivate their metabolism during the hibernation period," Whitney explained.

There is no levelling up, there are no weapons unlocks; it’s all about combining the different capabilities – from Mei’s endothermic blaster to Mercy’s healing staff – in effective ways.

“Because very young infants are more ectothermic than endothermic, their arousability could scale similarly to fish for different ambient temperatures.”

Unlike other species of sharks, great whites are endothermic, which means they can regulate their own body temperature instead of moving to warmer or colder waters.