The swimming file clam

 The swimming file clam can swim slowly and continuously for about 5 minutes at a time. It does this by opening and closing its valves and expelling water in a stream from either side of the hinge, a form of jet propulsion. In an aquarium, the animal flits around knocking into other objects. It uses its mantle tentacles in an oar-like fashion when swimming. Sometimes it sheds the longest tentacles and can still swim effectively without them, increasing the frequency of valve clapping to maintain speed. The detached tentacles secrete a noxious substance and continue to writhe after they are severed which may distract aggressors.

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