Yaks are a member of the bovine family and were originally domesticated in Tibet. They are mellow like cows, but intelligent like horses and can be trained. Their undercoat (down) is similar in quality to cashmere, and their outer guard hair can be spun and braided into ropes, bags, rugs, etc. They are more efficient eaters than cattle, and are both grazers and browsers. They produce milk with a high fat content that can be processed into butter, cheese, or yogurt. Wild yaks are about 2 meters tall at the shoulder, but domestic yaks are about half that height.
A cross between a yak and a cow is called a Dzo.