Close up shot of a male sand fiddler crab feeding on the micronutrients and create tiny balls of sand as the byproduct, forming small mounds around its burrow

sand fiddler crab calling mud flat wetland mangrove species ecosystem claw muddy 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 leptuca pugilator uca gelasimus ball sip mineral micronutrient feed pugnax burrow natural