Supreme fitness is a trait males of many species might like to show off when searching for a mate. Peacocks display their tails, the more elaborate of which require more energy to grow and carry around. Human men might strip off and strut down the beach. The Fiddler Crab, new research shows, attracts females by waving a brightly colored claw and then drumming it on the ground, a behavior that also seems to indicate the size of its home.
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