The shells of the rough fileclam aid movement through water via jet propulsion.

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"When danger threatens, this scallop claps its shells together and darts through the water, like a pair of castanets with a life of their own." (Downer 2002:14)

Weird Nature: An Astonishing Exploration of Nature's Strangest BehaviorMarch 2, 2002
John Downer

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