
Yellow-billed choughs are seen in Mount Qomolangma National Nature Reserve in southwest China's Tibet Autonomous Region, April 28, 2020. (Xinhua/Purbu Zhaxi)

Yellow-billed choughs are seen in Mount Qomolangma National Nature Reserve in southwest China's Tibet Autonomous Region, April 28, 2020. (Xinhua/Purbu Zhaxi)