pair of common gallinules or moorhens at pinckney island national wildlife refuge, south carolina

moorhen moor hen galllinule gallinula galeata waterhen pair two swamp chicken duckweed lemna minor animal aquatic south carolina sc pond pinckney island national wildlife refuge natural nature outdoor outside park swimming water wild bluffton hilton head foraging bird north america feather feathers beak vegetation avian fauna rallidae common gallinule