Domestic yak Bos mutus f grunniens

The yak was domesticated in Tibet from 3000 to 1000 B.C., and its progenitor is the wild yak (Bos mutus). It is almost one

This domesticated dog has been trained to help hunters retrieve game. (Photo by St. Meyers/Okapia/Photo Researchers, Inc. Reproduced by permission.)

third smaller than its wild progenitor and it has markedly weaker horns or no horns. It moves without any problems at altitudes of 9,800-19,500 ft (2,990-5,940 m). It is an indis-pensible helper for the mountain inhabitants and the basic source of livelihood. The yak provides milk, meat, and wool. Dried excrement is used as fuel. The yak is a great working animal. It bears around 330 lb (150 kg) very easily, it serves as a riding and draft animal, and is used for plowing. Twelve million yaks live in the mountains areas of Tibet, China, Nepal, Mongolia, and southern Siberia. It is bred to a small extent in North America and in the Swiss Alps.

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