blue winged geese cyanochen cyanoptera and yellow billed ducks anas undulata on the sululta plains in the ethiopian highlands

africa anas animal animals avian billed bird birding birds birdwatching blue brown cyanochen cyanoptera dabbling duck ducks endemic ethiopia fauna float flying geese goose lake marsh morning nature ornamental ornithology pond raise rare side species swamp undulata view watching water waterbird waterfowl wetland wild wildlife winged yellow