An aerial drone photo taken on June 15, 2024 shows trails left by Tibetan antelopes on the riverbed of the Tianshui River in the Qiangtang National Nature Reserve in southwest China's Xizang Autonomous Region. Tianshui River is an important migratory passage for pregnant Tibetan antelopes in the Qiangtang National Nature Reserve. (Xinhua/Jigme Dorje)