Yaks are one of the very common animals of Sikkim. Although they are domestic, I am not sure if the ones I saw in the mountains are domesticated. That is because I saw them grazing mostly un-escorted by people. They were present everywhere as we went higher. While the first couple of Yaks were seen as high as 13,000+ feet, we kept seeing them in good numbers as we went higher. They were there even at around 16,000 feet high where all the vegetation you see are some small grass that grow hardly a centimeter long. And everywhere, they seemed to be very busy grazing and doing little else. Although they look very strong, these animals are pretty timid.