Photo taken on Oct. 20, 2021 shows three wolves at the source of the Yellow River section of the Sanjiangyuan National Park in Golog Tibetan Autonomous Prefecture of northwest China's Qinghai Province. [Photo by Zhang Long/Xinhua]

Photo taken on Oct. 19, 2021 shows Tibetan antelopes at the source of the Yellow River section of the Sanjiangyuan National Park in Golog Tibetan Autonomous Prefecture of northwest China's Qinghai Province. [Photo by Zhang Long/Xinhua]

Photo taken on Oct. 20, 2021 shows Tibetan wild donkeys at the source of the Yellow River section of the Sanjiangyuan National Park in Golog Tibetan Autonomous Prefecture of northwest China's Qinghai Province. [Photo by Zhang Long/Xinhua]

Photo taken on Oct. 20, 2021 shows a Tibetan wild donkey at the source of the Yellow River section of the Sanjiangyuan National Park in Golog Tibetan Autonomous Prefecture of northwest China's Qinghai Province. [Photo by Zhang Long/Xinhua]