knob-billed duck (sarkidiornis melanotos) - commonly found in sub-saharan africa and south asia

africa animal aquatic asia avian beak beautiful behavior bill biodiversity bird birding birdwatching black conservation duck ecosystem eye feathers flight habitat knob knobbilled lake lover marsh melanotos natural nature observation ornithology perched plumage sarkidiornis south subsaharan watchful waterfowl wetland white wildlife