Tibetan gazelles and yaks are seen at Jiatang Grassland in Chindu County, Yushu Tibetan Autonomous Prefecture, northwest China's Qinghai Province, Aug. 14, 2019. Thirty-one participators gathered here to observe wild animals and ecological environment during the nature-observing event held from Aug. 12 to 14, at Jiatang Grassland, 4,200 meters above sea level. (Xinhua/Tian Wenjie)

A plateau pika is seen at Jiatang Grassland in Chindu County, Yushu Tibetan Autonomous Prefecture, northwest China's Qinghai Province, Aug. 14, 2019. Thirty-one participators gathered here to observe wild animals and ecological environment during the nature-observing event held from Aug. 12 to 14, at Jiatang Grassland, 4,200 meters above sea level. (Xinhua/Tian Wenjie)

A marmot is seen at Jiatang Grassland in Chindu County, Yushu Tibetan Autonomous Prefecture, northwest China's Qinghai Province, Aug. 14, 2019. Thirty-one participators gathered here to observe wild animals and ecological environment during the nature-observing event held from Aug. 12 to 14, at Jiatang Grassland, 4,200 meters above sea level. (Xinhua/Tian Wenjie)

Blue sheep are seen at Jiatang Grassland in Chindu County, Yushu Tibetan Autonomous Prefecture, northwest China's Qinghai Province, Aug. 14, 2019. Thirty-one participators gathered here to observe wild animals and ecological environment during the nature-observing event held from Aug. 12 to 14, at Jiatang Grassland, 4,200 meters above sea level. (Xinhua/Tian Wenjie)

Photo taken on Aug. 14, 2019 shows the scenery of Jiatang Grassland in Chindu County, Yushu Tibetan Autonomous Prefecture, northwest China's Qinghai Province. Thirty-one participators gathered here to observe wild animals and ecological environment during the nature-observing event held from Aug. 12 to 14, at Jiatang Grassland, 4,200 meters above sea level. (Xinhua/Tian Wenjie)

A Tibetan gazelle is seen at Jiatang Grassland in Chindu County, Yushu Tibetan Autonomous Prefecture, northwest China's Qinghai Province, Aug. 14, 2019. Thirty-one participators gathered here to observe wild animals and ecological environment during the nature-observing event held from Aug. 12 to 14, at Jiatang Grassland, 4,200 meters above sea level. (Xinhua/Zhang Dachuan)

A buteo prepares to eat at Jiatang Grassland in Chindu County, Yushu Tibetan Autonomous Prefecture, northwest China's Qinghai Province, Aug. 14, 2019. Thirty-one participators gathered here to observe wild animals and ecological environment during the nature-observing event held from Aug. 12 to 14, at Jiatang Grassland, 4,200 meters above sea level. (Xinhua/Zhang Dachuan)