Ключевые слова: activity, animal, animal activity, animal world, background, bark, beaver, beavers, bitten tree, botany, cut, damage, destruction, ecosystem, environment, fallen, forest, gnaw, gnawed, green, lake, landscape, march, nature, negative activity, nibble, nibbled, outdoor, park, plant, result, river, riverbank, riverside, rodent, sawdust, season, spring, swamp, teeth, timber, tree, trunk, water, wetland, wild, wild nature, wilderness, wildlife, wood,