To see a single whale shark - the world's largest fish, a solitary behemoth that can grow to school bus size - is a rare experience.

Seeing hundreds gathered in one place is unprecedented.

"It's one of the most incredible gatherings of animals that's ever been recorded. It's mind-blowing," said marine biologist Al Dove of the Georgia Aquarium. "As someone who studies whale sharks, which have a reputation of being something you see once in a blue moon, the idea of finding 400 in an area of the size of a couple football fields is unheard of."

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