A swan flies over Swan Lake at sunrise at Rongcheng national swan nature reserve in Rongcheng City, east China's Shandong Province, Dec. 17, 2016. (Xinhua/Wang Fudong)
A swan flies over Swan Lake at sunrise at Rongcheng national swan nature reserve in Rongcheng City, east China's Shandong Province, Dec. 17, 2016. (Xinhua/Wang Fudong)