A flock of female Tibetan antelopes run to the breeding area Zhuonai Lake after crossing the Qinghai-Tibet Railway in Hol Xil Nature Reserve, northwest China's Qinghai Province, June 7, 2016. Tens of thousands of Tibetan antelopes are migrating to give birth near Zhuonai Lake, which provides an ideal environment for breeding. (Photo/Xinhua)