Ключевые слова: animal, animals, aquatic, area, avian, background, beak, beautiful, bird, birds, botany, canada, common, duck, duckling, ducklings, ducks, duckweed, ecology, ecosystem, environment, feather, feathers, floating, flora, foliage, green, lake, landscape, leaf, mallard, natural, nature, ornithology, outdoor, outdoors, park, pond, river, seedling, spring, summer, swamp, swimming, water, water plants, weed, wet, wild, wildlife, wood,