beavers build a lodge

alter amidst and animals beaver beavers biology branches build building busy change dam dammed dams deforest ecosystem ecosystems encroach encroachment environment escavate extinct fell felling flooding forest gathering gnaw gnawing greenery industrious lake lakes lodge logging logs mammals nature nearly nocturnal occupation occupied persist persistance persistent pests processes repopulate river rivers stumps summer swim swimming threatened trees two washington wetland wetlands wild woods