Fiddler crabs use dishonest signalling to bluff about their fighting ability. When a claw is lost, a crab occasionally regrows a weaker claw that nevertheless intimidates crabs with smaller but stronger claws.

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Fiddler crab - Wikipedia

Waving-display in male of Uca leptodactylus illustrating fiddler

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Claw Size and Competition: Behaviors of Male Fiddler Crabs

Fiddler crab - Alchetron, The Free Social Encyclopedia

Fiddler crab - Wikipedia

Signalling Theory The Daily Omnivore

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Sexual Selection via Direct Male-Male Interactions

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Fighting with an unreliable weapon: opponent choice and risk

Fiddler Crabs Bluff Their Way Through Fights

1. Fiddler crabs are so called because males have a

The Fiddler crab on Hilton Head Island Photograph by Kim Pate