The ancient shark megalodon was not a cold-blooded killer, and that was one thing that caused its extinction.

"Scientists have discovered that the extinct megalodon shark was warm-blooded, as indicated by the isotopes in its tooth enamel. Their research suggests that the megalodon could maintain a body temperature about 13 degrees Fahrenheit warmer than the surrounding water, a significant difference compared to other contemporary sharks".(ScitechDaily.com/Megalodon Was No Cold-Blooded Killer – And That Spelled Its Doom)

The ancient shark, known as "megalodon" is one of the largest predators in history. Megalodon was probably a warm-blooded shark. Or actually, megalodon was something, that was a combination of shark and whale. That means the "Meg" was a warm-blooded shark that used gills for breath. The other thing was that megalodon was not more murderous than some tiger sharks.

Megalodon was a beast that needed lots of food and it had its place in evolution. But then some other sea predators reach that giant shark. Maybe those new predators like whales ate megalodon's calves. The whales had lungs. And they could also hunt in the water there was no oxygen. That made them able to reach megalodons.

Maybe ancient whales didn't eat full-size Megalodons but competition for the same food was destructive. The size of the megalodon was big. It was 17 meters long. And maybe its fate was a competition for food with Livyatan the ancestor of the sperm whale and other large sea mammals. Maybe full-scale megalodon was safe from "Livyatan". Livyatan was also 17 meters long and about the same size as megalodon.

But immature individuals were good food to those ancient whales. And when Livyatan faced full-scale megalodon the winner was whose bite was sharpest.

But the other thing that made whales superior to megalodons was sonar. That allowed whales to hunt their prey in darkness. The sound system that those ancient whales used was suitable to use as a weapon. Sound weapons could break the megalodon's bones. And even today whales use soundwaves to track and terminate their prey.

https://scitechdaily.com/megalodon-was-no-cold-blooded-killer-and-that-spelled-its-doom/

https://en.wikipedia.org/wiki/Livyatan

https://en.wikipedia.org/wiki/Megalodon

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