Photo shows groups of wild yaks forage in the east part of the Altun Mountains National Nature Reserve, northwest China’s Xinjiang. (Photo by Shiliuyun-Xinjiang Daily/ Li Peifeng)

Photo shows the Ayakkum Lake in the east part of the Altun Mountains National Nature Reserve, northwest China’s Xinjiang. (Photo by Shiliuyun-Xinjiang Daily/ Li Peifeng)

Photo shows the Ayakkum Lake in the east part of the Altun Mountains National Nature Reserve, northwest China’s Xinjiang. (Photo by Shiliuyun-Xinjiang Daily/ Li Peifeng)

Photo shows staffs collect images in the infrared cameras in the Altun Mountains National Nature Reserve, northwest China’s Xinjiang. (Photo by Shiliuyun-Xinjiang Daily/ Li Peifeng)

Photo shows a staff collects images in the infrared cameras in the Altun Mountains National Nature Reserve, northwest China’s Xinjiang. (Photo by Shiliuyun-Xinjiang Daily/ Li Peifeng)

Photo shows the sunset glow in the Altun Mountains National Nature Reserve, northwest China’s Xinjiang. (Photo by Shiliuyun-Xinjiang Daily/ Li Peifeng)

Photo shows Tibetan wild ass running at the Yixekpat Wetland in the east part of the Altun Mountains National Nature Reserve, northwest China’s Xinjiang. (Photo by Shiliuyun-Xinjiang Daily/ Li Peifeng)

Photo shows Tibetan wild ass running at the Yixekpat Wetland in the east part of the Altun Mountains National Nature Reserve, northwest China’s Xinjiang. (Photo by Shiliuyun-Xinjiang Daily/ Li Peifeng)

Photo shows a wild yak at the Yixekpat Wetland in the east part of the Altun Mountains National Nature Reserve, northwest China’s Xinjiang. (Photo by Shiliuyun-Xinjiang Daily/ Li Peifeng)

Photo shows wild yaks at the Yixekpat Wetland in the east part of the Altun Mountains National Nature Reserve, northwest China’s Xinjiang. (Photo by Shiliuyun-Xinjiang Daily/ Li Peifeng)

Photo shows the Shaziquan fountain in the Altun Mountains National Nature Reserve, northwest China’s Xinjiang. (Photo by Shiliuyun-Xinjiang Daily/ Li Peifeng)

Photo shows the Shaziquan fountain in the Altun Mountains National Nature Reserve, northwest China’s Xinjiang. (Photo by Shiliuyun-Xinjiang Daily/ Li Peifeng)

Photo shows Mount Muztag, the main peak of the middle part of the Kunlun Mountains, northwest China’s Xinjiang. (Photo by Shiliuyun-Xinjiang Daily/ Li Peifeng)

Photo shows Mount Muztag, the main peak of the middle part of the Kunlun Mountains, northwest China’s Xinjiang. (Photo by Shiliuyun-Xinjiang Daily/ Li Peifeng)

Photo shows Tibetan antelopes around the Tuzi Lake in the Altun Mountains National Nature Reserve, northwest China’s Xinjiang. (Photo by Shiliuyun-Xinjiang Daily/ Li Peifeng)

Photo shows Tibetan antelopes around the Tuzi Lake in the Altun Mountains National Nature Reserve, northwest China’s Xinjiang. (Photo by Shiliuyun-Xinjiang Daily/ Li Peifeng)

Photo shows Tibetan antelopes around the Tuzi Lake in the Altun Mountains National Nature Reserve, northwest China’s Xinjiang. (Photo by Shiliuyun-Xinjiang Daily/ Li Peifeng)

Photo shows wild yaks in the Altun Mountains National Nature Reserve, northwest China’s Xinjiang. (Photo by Shiliuyun-Xinjiang Daily/ Li Peifeng)

Photo shows a black-necked crane in the Altun Mountains National Nature Reserve, northwest China’s Xinjiang. (Photo by Shiliuyun-Xinjiang Daily/ Li Peifeng)