bar-headed goose, anser indicus, goose from central asia in colonies of thousands near mountain lakes. white grey black duck in

africa african animal aves bill bird birding birdwatching botswana china conservation duck fauna feather flora flying fowl gambensis geese goose kenya lake large migratory namibia national natural nature okavango outdoors park plectropterus portrait red south southern spur spurwinged tanzania travel uganda watching waterbird wild wilderness wildlife wing winged zimbabwe