The highland pastures of Nyingchi in Xizang bloom with a carpet of wildflowers dotted with yaks in summer. Curling smoke rises from wooden shelters. Herders uphold the tradition of raising yaks and Tibetan fragrant pigs, a local breed. Yaks are vital in Xizang: Their meat and milk are used for food, their fur for clothing, and their dung for fuel for campfires, forming a self-sustaining nomadic lifestyle.