Why do shrimp swim backwards?

backwards shrimp swim
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Why do shrimp swim backwards?

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It is a reflex used to escape danger. They powerfully curle their tails, and the large tail fan pushes them backwards. As this is the fastest movement they can make, it’s the one they use. It also means that they can fend off their attacker with their claws while they run. Some species swim forwards too, but it’s much slower.