How did fiddler crabs get their name?

The male fiddler crabs have one claw that is much larger than the other. This extra large claw is shaped like a fiddle.fiddles 015

It is useful for two main reasons.

The first being that if waved in a certain manner it attracts some hot chicks, er, female fiddler crabs. The second is that it is a  useful tool for defense when other dudes like to create drama during mating season.

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Image (c) decksfiddles.com

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