Ключевые слова: background, bark, beaver, beavers, birch, bite, branch, chew, chip, chopped, cold, dam, damage, destruction, driller, eat, eating, ecology, ecosystem, environment, fallen, forest, gnaw, lake, leningrad region, natural, nature, pest, pond, river, rodent, sawdust, sharp teeth, spring, stump, tail, teeth, teeth marks, tree, tree trunk, trunk, willow, wood, wood cutting, work,