Ключевые слова: adult, aix, anatidae, animal, animalia, autumnal, aves, avian, beak, beautiful, beauty, bird, birding, brine, chordata, color, colorful, couple, drake, duck, during, feather, female, green, hd, isolated, light, mallard, mechanism, natural, nature, pond, poultry, times, water, waterfowl, wild, wildlife,