Most Mantis Shrimp are tropical but one species is common along the North American Atlantic coast. They usually live in rock or coral crevices or in burrows excavated in sediments. Mantis Shrimp have modified appendages that are enlarged and can use them to smash or spear prey.
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While most crabs cannot swim, the Blue Crab is the most powerful and agile swimmer of all crustaceans. The last pair of legs end in broad, flattened paddles that move in a figure-eight pattern during swimming. Acting as propellers, the crab is able to swim sideways, backward, and forward
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Barnacles are the only crustaceans that cannot move. They can be found attached to rocks, shells, coral, or other objects. Oftentimes, some species attach to the hull of a ship in large numbers and increase the drag, slowing it. Other barnacles attach to whales or large fish.
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