Did megalodon live in warm or cold water?

There is much debate over what the preferred temperature was for the now-extinct megalodon shark, with some believing that the giant beasts preferred warmer waters while others theorize they may have been able to tolerate a wider range of temperatures. Most sharks today are ectotherms, meaning their internal temperature depends on the temperature of the water around them. Megalodon, however, was a giant predator--growing up to 60 feet long--and would have needed a lot of energy to maintain its massive body. For this reason, some scientists believe that megalodon was actually an endotherm, meaning it could regulate its own body temperature. If megalodon was indeed an endotherm, it would have needed to eat a lot of food to maintain its body temperature. This would have been difficult to do in cold water, where there is less food available. For this reason, it is likely that megalodon preferred warm waters, where there was an abundance of food. There is evidence that megalodon did in fact prefer warm waters. For one, its teeth are very similar to those of other sharks that live in warm waters today. Additionally, megalodon fossils have been found in tropical and subtropical regions of the world, further indicating that the giant shark preferred these warmer waters. So, while we can’t say for sure what the preferred temperature was for megalodon, the evidence seems to suggest that the giant shark preferred warm waters.