New Princeton research shows that prehistoric megatooth sharks the biggest sharks that ever lived were apex predators at the highest trophic level ever measured.
In the mid-nineteenth century, German biologist Carl Bergmann decided there was enough evidence to state that within a given species, larger-sized specimens are found in colder environments, while smaller-sized are found in warmer regions – an observation that eventually became known as “Bergmann's rule” as other researchers found examples, such as the giant penguins of
Megalodon sharks are believed to grow larger in cooler temperatures because bigger body sizes help them retain more heat. Read the article to know how this discovery relates to modern sharks.