National Geographic : 1955 May
V irationai ueograpnic society 674 Nature's Lumberjack Sinks Chisel Teeth into a Juicy Aspen Circling the tree, the beaver notches a wide band about the trunk. Then, with wrenching bites, it tapers the bole to a point; the tree snaps. Gravity, not the beaver, directs the fall. On smaller trees the logger completes his cutting on one side. The animal usually works alone, but two may collaborate on a large tree.