Ключевые слова: anas, anatidae, anseriformes, aves, biology, bird, colorful, colors, diving duck, duck, ecology, ethology, feather, feathers, fly, ice, italy, lake, mallard, natural, natures, net rufina, ornithology, pond, red, redcrested pochard, river, snow, snowy, swimmer, swimming, wilderness, wildlife, wings, winter, zoology,