Megalodon sharks were capable of reaching sizes up to 60 feet long. Some scientists believed the sharks could grow to 70 feet long, although most Megalodons were 40 to 50 feet long. Scientists believe that Megalodons often fed on whales to support their diet.
Great white sharks, which descended from Megalodons, only reach about 15 to 20 feet long in comparison. The Megalodon species became extinct around two million years ago, and a scientist named Catalina Pimiento discovered in 2013 that the average size of the species had been increasing over the span of its 14 million year existence. The exact reason for the Megalodon's extinction remains unknown.