Wild male sand fiddler crab with one distinctive enlarged claw, feeding on micronutrients and create tiny balls of sand as the byproduct around its burrow, close up shot

sand fiddler crab calling wetland mangrove species ecosystem claw sediment eat gaomei marsh taichung taiwan nature habitat environment swamp beach animal water crustacean soil tidal forage coastal male asymmetric wildlife malaysia shore atlantic vocans calico leptuca pugilator uca gelasimus ball sip mineral micronutrient feed pugnax natural thailand food burrow