Stock photography, photos: Paper Birch Cut Down By Beaver Stock photos of Effects of a beaver's (Castior canadensis) gnawing on a paper birch (Betula papyrifera) tree. Photograph: © Matthew Thalman Click for a larger image and more information Keywords associated with this stock photo: America, animal, Autumn, autumn, autumnal equinox, beast, beasts, beaver, Betula papyrifera, Birch, Castior canadensis, creature, cut, deciduous, fall, fallen, gnaw, Itasca, Itasca State Park, itasca state park, mammals, Minnesota, minnesota, North America, Paper Birch, paper birch, park, parks, plants, season, State Park, State Parks, tree, United States of America, US, USA, wildlife, zoology