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The huge, gaping mouth is the whale shark's adaptation to feeding on plankton; the wider his mouth opens the more plankton he can scoop up with each "bite". All the water that he takes in to scoop up his meal is simply passed out of his body through his gills, which have sieve-like membranes covering them to filter out the little critters and prevent them from escaping. If you were accidentally scooped up by the whale shark you would find yourself being spit back out through an interesting process called gastric eversion. The whale shark actually turns its stomach inside out and spits it out through its mouth, ejecting the entire contents.

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13y ago

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