Ключевые слова: animal, animal kingdom, aquatic, beautiful, beaver, beaver dam, branch, building, chew, color image, colorado, construction, dam, duck pond, ecosystem, engineer, environment, filed, found, fur, gnawing, habitat, heap, horizontal, industrious, lake, lodger, mammal, natural, nature, no people, on, paddle, reflection, resourceful, river, springtime, stick, stream, tail, teeth, tree, underwater, usa, vegetation, water, wetland, wood, working,