Our equipment's mode of transportation, the Jopkyo! (If you want to say with with a Sherpa accent, 'Zope-key-yo') Cows can only go up to about 12,000 feet, while Yaks can only go as low as 10,000. The Jopkyo, a hybrid of the two, is the answer. Because they're sterile, each one has to be made from scratch.