National Geographic : 1935 Aug
EFFICIENT BEAVERS SCORN LIGHT LOADS This one holds a severed aspen branch in one paw while he cuts another to make the trip worth while. Then, adjusting them in his mouth, he will tow them away, using webbed hind feet for propellers. When all trees near a pond have been cut, beavers often build canals to transport supplies from a distance. Photographs ©Wendell Chapman THE WOODMANWHO USES HIS TEETH FOR AN AX Tree felling is usually done byapair ofbeavers, who can cut down athree inch sapling in three minutes. On larger trunks they work inturn while one stands guard or rests. There are extensive beaver workings near Tower Falls, in Yellowstone National Park.