National Geographic : 1943 May
A Yak Caravan Comes in from the Plateau, Unloads Wool, and Takes on Green Tea atTatsienlu Though moving more slowly than a walking horse, the yak is a useful beast of burden, living almost entirely bygrazing. Heissometimes hard tohandle. He supplies Tibetans with hair for their tents, hides for equipment, and meat, milk, butter, and cheese for food. A boy orwoman continually walks around therear and flanks of the procession stinging the laggards or stragglers with small stones from a braided hair sling. To the rightisaferocious black Tibetan mastiff (page 627).