After the whale shark, the basking shark is the second largest living fish, and can grow up to 32 feet long. These sharks are often mistaken for plesiosaurs, a group of long-necked, predatory marine reptiles that lived at the time of the dinosaurs. Underwater Creatures, Underwater Life, Ocean Creatures, Beautiful Creatures, Animals Beautiful, Basking Shark, Big Shark, Shark Fish, Whale Sharks