The whale shark is most popularly known for its gigantic size. Despite being called a whale, the whale shark is not a whale at all. The term, whale, in their name is due to the large size that is comparable to cetaceans. They are the biggest fish in the world. Many people are surprised to learn that whale sharks are filter feeders and their diets consist of tiny plankton, shrimp, krill, larvae, small fish, and even some algae. With quite an imposing size, most people are relieved to learn that whale sharks pose no great threat to humans.