fiddler crab

noun
any small, burrowing crab of the genus Uca, characterized by one greatly enlarged claw in the male.

Origin:
1700–10, Americanism

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World English Dictionary
fiddler crab
 
n
any of various burrowing crabs of the genus Uca of American coastal regions, the males of which have one of their anterior pincer-like claws very much enlarged
 
[C19: referring to the rapid fiddling movement of the enlarged anterior claw of the males, used to attract females]

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Example sentences
The park supports a wide variety of marine life, including shrimp and fiddler crab.
The fiddler crab's shell is squarish, males have one large claw.
The fiddler crab breathes air and lives in a burrow in the mud.
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