Whale sharks are the largest fish in the world, with the longest ever recorded at over 13.5m. Fortunately, they are harmless filter feeders that suck in plankton and small fish. Curiously, there are rows of tiny teeth within the whale shark's impressively large mouth that, as yet, serve no known function. These distinctively yellow-spotted sharks are migratory and found throughout the world's oceans, preferring the warm and tropical waters around the equator.

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