Ключевые слова: animal, audubon, background, beautiful, beauty, bird, birding, city, close, colorful, duck, environment, europe, european, feathers, female, grass, green, group, habitat, hunting, lake, male, mallard, natural, nature, north, oregon, ornithology, outdoors, pair, park, pond, profile, spring, stockholm, summer, sweden, swimming, urban, viewing, watching, water, waterfowl, wetland, wild, wildfowl, wildlife,