black swan, blue-billed duck and plumed whistling-duck feeding on pond

animal aquatic atratus australia australian australis avian beak bill bird birding birdwatching black blue bluebilled cygnus duck feather feeding floating freshwater grass green head lake leaf long male nature neck ornithology outdoors oxyura pale park plumage plumed pond pool red rippled ripples river scene shadows stifftailed sunlight swan sydney tip water waterbird waterfowl wetland whistlingduck wild wildlife