Ключевые слова: agriculture, american black duck, anatidae, animal, animals, background, beak, beautiful, bird, birding, birds, black duck, blue, color, colorful, dabblers, duck, farm, fauna, feather, feathers, grass, green, group, horizontal, lake, livestock, male, mallard, natural, nature, nesting, outdoors, park, pond, pool, river, safe, standing, swamp, together, urban park, water, waterfowl, web footed, wild, wildlife, young, zoo,