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The rare sight of a wild yak (Bos mutus) joining a domestic herd is welcomed by nomads but bulls can also kill people. The reserve is haven for rare wildlife including snow leopard, Tibetan antelope and black-necked cranes. The survival of nomadic life continues to depend on the wildlife.Sanjiangyuan - The three rivers headwaters. The Tibetan plateau is the world's third pole, producing fresh water for billions downstream. In China, the future of the nation depends on how this water tower is conserved.  Where the Yangtze, Yellow and Mekong rivers begin, Tibetan nomads are moving to protect the land, its wildlife and in the process their ancient culture from melting away in the face of resettlement and urbanisation..