Photo taken on Dec. 27, 2017 shows the scenery of Napa Lake Wetland in Diqing, southwest China's Yunnan Province. During the winter time, the birds in Diqing Zhuang Autonomous Prefecture attract a lot of tourists. (Xinhua/Liang Zhiqiang)

Photo taken on Dec. 27, 2017 shows the scenery of Napa Lake Wetland in Diqing, southwest China's Yunnan Province. During the winter time, the birds in Diqing Zhuang Autonomous Prefecture attract a lot of tourists. (Xinhua/Liang Zhiqiang)