Gahai Lake wetland becomes home for endangered migrant bird species

Bar-headed geese are seen in Gahai Lake wetland in Luqu County of the Tibetan Autonomous Prefecture of Gannan, northwest China's Gansu Province, June 2, 2021. Gahai Lake wetland on the Qinghai-Tibet Plateau has become home for some endangered migrant bird species over the years thanks to its improving ecological environment. (Xinhua/Du Zheyu)