What is a group of crabs called?

Crabs are decapod crustaceans belonging to the infraorder Brachyura, which contains over 6,700 species. One group of crabs that is particularly interesting is the fiddler crabs, belonging to the genus Uca.

Fiddler crabs are small burrowing crabs that can be found in intertidal mudflats, salt marshes, and mangrove swamps. They are easily recognizable by the distinct asymmetric claws, with one claw being much larger than the other. The larger claw is used by males to attract females and to signal to other males during displays and fights.

Fiddler crabs are social animals and can often be found in large groups, known as casts. They communicate using visual displays, waving their claws in certain patterns to convey information to other crabs.

These crabs have a key role in the ecosystems they inhabit, as they help to aerate the sediment and recycle organic matter. They are also an important food source for birds, fish, and other predators.

Overall, fiddler crabs are fascinating creatures with unique behaviors and adaptations that make them an interesting group of crabs to study.