Red head Merganser bird with webbed feet walks

goosander common merganser merganser waterbird water bird waterfowl riverbank avian duck bird seaduck fowl webbed feet plumage riparian ornithology beak wildlife birdwatching habitat female anatinae walk river environment shore red head glide nature stone sand bar rock float sandbar swim webbed wilderness natural determination water determined wild aquatic feather shallow mergus outdoor red crest