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

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