noun
also fiddler
1. : any of numerous burrowing crabs of the genus Uca widely distributed in salt marshes and along sandy or muddy shores of No. and So. America, the Indian ocean, and other areas and having in the male one claw much enlarged and often held in a position suggesting that in which a fiddle is held — called also beckoning crab, fighting crab
2. : any of several crabs structurally similar to the fiddler crab
[s]fiddlerc.jpg[/s]