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Most arthropods utilize legs or fins to move, but some of the following animals have unusual movement systems; some clams can jump, squid use biological jet engines to shoot water out of their bodies and propel themselves, extinct anomalocaris used flat rows of spikes made of chitin (typical arthropod exoskeleton material) to propel themselves by doing a wave motion that slowly, but effectively, through the water by pushing water behind themselves. But sometimes sacrifices energy to accelerate.

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