Megalodons were the largest sharks of all time, but whale sharks are the largest sharks in the sea today. Indeed, they hold the record for the biggest extant fish, reaching confirmed lengths of up to 41.5 feet. And at about 47,000 pounds, these animals rival dinosaurs in weight! But in terms of their feeding habits, they behave more like large whales than predatory sharks. They feed almost exclusively on plankton, krill, and larvae, and pose no threat to humans. In fact, their docile temperament makes them a popular shark among divers. Juvenile whale sharks enjoy playing with curious humans, and the adults don't mind giving the occasional diver a ride on their dorsal fins. Like their namesake, these animals are gentle giants.