Ключевые слова: altitude, anas platyrhynchos, animal, aquatic, autumn, beak, beautiful, biology, bird, blue, branch, brown, creature, dabbling, duck, feather, flight, fowl, gliding, group, height, hunter, hunting, impetuous, lake, mallard, many, migration, nature, ornithology, park, plumage, plume, quick, river, sky, spring, springtime, sunlight, sunshine, turn, velocity, vertical, water, waterfowl, wild, wildlife, wind, wings,