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.

Waving-display in male of Uca leptodactylus illustrating fiddler

Fiddler crab - Wikipedia

Behavior Brief The Scientist Magazine®

Fiddler crab

Fiddler Crab Encyclopedia MDPI

Fiddler crab - Alchetron, The Free Social Encyclopedia

Fighting with an unreliable weapon: opponent choice and risk

Fiddler Crabs Fighting

Fiddler Crab Encyclopedia MDPI

The Fiddler crab on Hilton Head Island Photograph by Kim Pate - Pixels

Fiddler Crab, Weird n' Wild Creatures Wiki

Delivery fee' for printing the ticket yourself : r/mildlyinfuriating

A Weapon For All Reasons Smithsonian Tropical Research Institute