This is SeaTalk: Ocean News from the University of Delaware.

Small and speedy, fiddler crabs can often be spotted scurrying along the banks of Delaware’s marshes at low tide. More social than other crabs, fiddlers live within the tidal zone and in close quarters, appearing in large groups to feed when tidal waters recede, then retreating to their extensive burrows as the tide comes in. Males are easily identified by their one enlarged claw, which they wave and tap during courtship rituals and use to ward off other males. The oversized claw also gives the crabs their unique name, as it appears like the males are playing a fiddle when they wave it around or use it to feed.

This is SeaTalk, a public service announcement from the University of Delaware, the Delaware Sea Grant College Program, and this station.