Heavyweight domestic animal.
Yaks live mainly on mountain pastures at altitudes of between 3,000 and 4,000 metres in the Tibet Autonomous Region, China, and Mongolia. Because of their ability to adapt to the cold, high altitudes and low atmospheric pressure, they can even be found in the Tibetan Highlands as high as 6,000 metres. For the Asian nomadic peoples, yaks, which weigh up to 400 kilogrammes, are the basis of life. They supply milk, meat, wool and leather, and their dried dung is used as fuel for fires. More importantly, at high altitudes, the "grunting oxen" (Carl von Linné designated the domestic yak as Bos grunniens in 1766 because of the incessantly audible animal sounds the yaks are prone to give) are the solely remaining animals which can be used as riding or pack animals. In one year, a yak can only supply between 400 and 600 grammes of the fine undercoat, obtained in spring when the nomadic shepherds comb the young animals.