National Geographic : 1935 Aug
WITH WILD ANIMALS IN THE ROCKIES A BEAVER'S SHARP INCISORS MAKE SWIFT WORK OF ASPEN When a tree has been felled, branches are trimmed off first and used either for dam building or food. Then the trunk is cut into short lengths and stacked on the pond bottom near the lodge. Photographs U( Wendell Chapman PADDLE TAIL IS RUDDER, PROP, AND DANGER SIGNAL Before a beaver dives, it gives a warning slap with its tail that echoes across the pond. On land, tail and hind feet make a stable tripod. Long, coarse hairs cover the soft underfur of commerce. The high price set on this fur lured trappers and explorers westward. Thus the beaver, to its own misfortune, helped colonize North America.