Ключевые слова: animal, aquatic, beak, beautiful, bill, bird, bright, brown, calm, drake, duck, environment, feather, fowl, green, light, male, mallard, nature, one, ornithology, outdoor, park, peace, plumage, pond, quack, reflection, serene, surface, variegated, vertebrate, water, waterfowl, webbed, white, wild, wildfowl, wildlife, wing, zoology,