Ключевые слова: afternoon, anas, animal, aquatic, autumn, avian, beak, bird, blue, closeup, color, dimorphism, drake, duck, europe, evening, feather, floating, fresh, full, gray, green, head, lake, length, male, mallard, natural, nature, netherlands, nobody, october, one, outdoor, park, pond, pool, profile, reflection, reserve, river, sexual, side, swimming, view, water, waterbird, waterfowl, wild, wildlife,