radjah shelduck (radjah radjah) confronting dusky moorhen : (pix sanjiv shukla)

algae anatidae aquatic australia bands birds blackbacked brakish burdekin coastline collar communicate cosmopolitan dark distinctive distribution duck family feathers flight floating flocks forests freshwater green guinea harsh inhabits insects islands maluku mangrove materials mollusks moluccas outstretched protected radjah raja rattle salty sedge shelduck small surface swamp swimming tropical water waterfowl weeds whistle white wingtips wings worms