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• n  burrowing crab of American coastal regions having one claw much enlarged in the male

News & Articles

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• Big crab claws for bling or bang?
  Male fiddler crabs tread an evolutionary fine line between growing an enlarged claw better for signalling to females or one better for fighting. Long light claws are better for attracting females, but not for fighting.
  July 16, 2013 - Science Daily