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As with all pronograde organisms with sensory organs located on the head, the normal motion of a lobster is notionally "forward" in that direction; but in many crustaceans like shrimp, lobster, crayfish, there exists a "caridoid escape reaction" by which they can achieve a burst of speed by abdominal muscle compression, used to escape predators, in effect flipping their tail to swim suddenly backwards.

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11y ago

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