Wild male fiddler crab, austruca annulipes with asymmetric claws, foraging and sipping on the minerals on the sandy beach during low tide period, close up shot of marine wildlife

calling crab ring legged fiddler austruca annulipes wildlife animal marine ecosystem beach sand male claw sip mineral uca feed mangrove coastline porcelain shore singapore malaysia indonesia thailand wetland ball species sediment eat nature habitat crustacean tidal forage coastal asymmetric vocans gelasimus natural food flat sandflat dominant low tide sandy marsh