Most sharks are Ecthoterms, cold-blooded fish. The Megalodon was a massive shark that went extinct 3.6 million years ago, and like some shark species, it was not a cold-blooded fish, it could keep its blood temperature about 7 degrees warmer than its surrounding water.
Photo by: https://commons.wikimedia.org/wiki/File:Carcharodon_megalodon_size_compasison_with_man.png
