Pictures of the domestic yak (Bos grunniens). With wide hooves and the ability to carry large weights at high elevations, domesticated yaks serve as beasts of burden for people in the Tibetan plateau.
Yaks breath more slowly than lowland cattle and have more red blood cels, which helps them to absorb oxygen from the thin air that you find at high altitudes in the mountains. Yaks require very little food and can withstand temperatures as low as -40 degrees Farenheit.
Yaks live in the high elevations of plateaus and mountain slopes of Tibet, where there is little vegetation. They eat grass, herbs, and lichen. They have a lifespan of up to 25 years and weigh up to 2,200 pounds. At their sholders, they are about 6 feet tall. Their horns can be up to 3 feet.