National Geographic : 1953 Aug
Adolph Murie 250 Far from Civilization's Threats, Mount McKinley National Park Presents an Outdoor Museum Alaska's Dall sheep (right) is white instead of sandy brown like its cousin, the Rocky Mountain bighorn; also. its horns are more slender and wide spreading. In the park visitors can sometimes approach quite close to these mountain sheep. Dalls particularly frequent the north side of the Alaska Range. where snow is lighter and feeding grounds are swept bare by the winter winds. This dignified ram perches safely on a crag near Sable Pass (pages 268, 269). The willow ptarmigan (left), an arctic grouse found in willow thickets, excites more curiosity than any other bird in the park. This male wears fashionable brown and white for the breeding season; his winter plumage is white. If alarmed, he cackles loudly like an alarm clock running down (pages 256, 269). Mount McKinley's beavers thrust butt ends of green wood into the mud for food when ponds freeze. This specimen gnaws a meal of aspen bark.