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for in male courtship displays may also be used in agonistic behavior between two males for a mate. In fiddler crabs (genus Uca), males have been sexually selected to have one enlarged claw, which can take up anywhere from a third to a half of their total body mass, and one regular claw. Although the enlarged claw is believed to have developed for use in combat for territorial defense, it is not uncommon for males to employ this

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