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And the answer is Bravo, a fish. A whale shark is a fish because it breathes through gills, has fins, and lives its entire life in the water. More specifically, it does have a skeleton, and it is made of cartilage like a shark rather than bone. But whales, on the other hand, are mammals. They breathe air with lungs, are warm blooded, and mothers nurse their young with milk. So, although it's a great size, or its great size, earned its name as the whale shark. It is scientifically a shark, and therefore the largest fish in the world. It filters plankton and other tiny food from seawater through its gills rather than hunting large animals. Alright, that is the all trivia for the 30th of August.