the flame-backed fiddler crab, or uca flammula, also called the darwin red-legs near burrow in mudflat

animal aquatic arthropoda australia backed background beach black burrow claw clay closeup color colorful crab crustacean darwin environment estuary eye fauna fiddler flame flammula hole hunt hunter legs mangrove marine mud mudflat natural nature nipper northern pincer predator prey red sand scavenger shellfish shore small territory tropical uca walk wetland wild wildlife