An elegant black necked swan, cygnus melancoryphus swimming across wavy river on a tranquil afternoon, close up tracking shot

swan anatidae waterfowl waterbird necked beak wildlife graceful melancoryphus birdwatching cygnus glide bird pond purity ornithology animal marsh freshwater neck majestic nature elegance lake species environment park elegant swim macro river beautiful aquatic portrait feather bill habitat knob natural close up white outdoors water wild south america wavy black argentina buenos aires