Yak Milk, contrary to the Trivial Pursuit game, is not pink but yak butter's legendary status is well deserved. Yak butter tea is the comfort food of the Himalayas with native herders drinking as many as 40 cups a day. Yak milk is rich in butterfat at around 6% to 11% making it perfect for yogurt, butter, and cheese.
Yaks evolved under harsh mountain conditions and are well adapted for winter. Their bags and teats are small, compact and close to the body so they don't freeze. In Tibet yaks are primarily considered dairy animals. Yak butter tea made from fresh butter is quite good, although very rich. Tibetan nomads have no refrigeration so sometimes the butter can become rancid.