Easily the most terrifying prehistoric creature would be Megalodon, the ancestor of the great white shark. While the largest great white shark was over twenty feet in length, Megalodon was three times that size at 60 feet! Its jaws had a bite radius was roughly three yards across and its teeth were seven inches long. As Quint from Jaws would say, “This shark swallow you whole!” Still, Jaws is a mere sardine compared to Megalodon. Megalodon was so big and powerful that it most fed on whales. When the climate changed and the whales migrated further north, Megalodon’s food supply eventually ran out, which resulted in its extinction.
In various forms of mythology, there was mention of a mighty sea serpent known as the Leviathan. Since I am drawing inspiration from prehistoric wildlife for my fantasy series, I am thinking of making Megalodon the Leviathan. Imagine how medieval galleys and longships would react when they see this monster swimming past them. Gives me the goosebumps!