![]() “The evolution of mesothermy is related with enhancing prey intake,” says Swansea University paleontologist Catalina Pimiento, who was not part of the new study. ![]() A warm, energetic shark needs more food than a slow, cold-running one, and large prey like blubber-rich seals offer a more economical way to feed. ![]() The largest predatory shark alive today, the great white shark, frequently feeds on marine mammals because its body requires such rich food.īut how did lamniform sharks evolve warm metabolisms in the first place? Shimada and colleagues suggest that competition in the womb, even cannibalism, had an important role to play. Today’s lamniform sharks reproduce in a particular way. “Lamniform sharks don’t lay their eggs outside of the body, but instead the eggs hatch inside the mother,” Shimada says. From there, the pups develop until they’re ready to leave the womb.
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