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Hermit Crab

The hermit crab isn't a loner like its name implies. They actually live in large colonies in the wild and possess some remarkably sophisticated social behavior. The crabs will line up in front of an empty shell, and when a crab arrives who's a perfect fit for the brand-new home, it goes to the head of the line to move in. The next biggest crustacean takes that crab's vacated shell, and then everyone else exchanges shells in order.

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