fiddler crab on the sand or mud

animal animalia ant arthropoda beach big biola calling clamp claw claws close crab crabs crustacean dimorphism dwimorfisme ecosystem fiddler food forest galapagos ghost insect kepiting macro malacostraca mangrove marine minax moulting nature ocean ocypode ocypodidae red sand sea seafood shell shellfish small tweezers uca ucinae vocans water wildlife