Megalodon was a prehistoric 50 foot shark. Megalodon fed on whales. The name Megalodon meant big tooth. Carcharodon Megalodon, often called the C. Megalodon is regarded as one of the most powerful and largest predators in history. One report of a Megalodon is from an Australian fisherman. He reported that a ghostly white shark as long as the 115 foot wharf they were standing on stole their crayfish pots (said in Tales of the Cryptids Mysterious Creatures That May or may not Exist by Halls,Spears,& Young).