Its unnaturally large claw is used for catching prey, for self-defence, and most surprisingly, for its mating call. Most aspects of the crab's life revolve around it, which may explain why the crab becomes fearful and docile when the claw is damaged. It would also account for the claw's remarkable regenerative capabilities, which can restore it completely in a single night. It is also known to blow bubbles when under attack, but this is a result of it venting from the wrong discharge valve when under extreme stress.
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