Spot-flanked gallinule swims in dark water and dips beak, close-up

porphyriops melanops spotflanked gallinule gallinule rallidae porphyriops bird swim wild wildlife wild life wilderness animal natural habitat nature ornithology birdwatching bird watching sea bird seabird waterfowl water fowl fowl aquatic waterbird water bird closeup close water sea lake surface pond river argentina south america pluck plumage wing feather beak dip eat pan follow yellow brown spotted