Ключевые слова: animal, beak, biology, bird, birds, creature, ducks, ecology, environment, eurasian, eye, fauna, feather, floating, flying, forest, head, hunting, lake, mareca, natural, nature, ornithology, outdoor, penelope, pond, predator, river, selective, small, swimming, water, waterfowl, wigeon, wild, wildlife, wing, zoo, zoology,