[InKunming--Yunnan]  Photo taken on Feb. 27, 2016 shows the scenery of Tiaodun River at Dashanbao Black-necked Crane Nature Reserve in Zhaotong City, southwest China's Yunnan Province. (Xinhua/Hu Chao)

Photo taken on Feb. 28, 2016 shows the scenery of sunrise on the Dahaizi Wetland at Dashanbao Black-necked Crane Nature Reserve in Zhaotong City, southwest China's Yunnan Province. (Xinhua/Hu Chao)

Black-necked cranes are seen before sunrise at Dahaizi Wetland at Dashanbao Black-necked Crane Nature Reserve in Zhaotong City, southwest China's Yunnan Province, Feb. 28, 2016. (Xinhua/Hu Chao)

Photo taken on Feb. 27, 2016 shows the scenery of Tiaodun River at Dashanbao Black-neck Crane Nature Reserve in Zhaotong City, southwest China's Yunnan Province. (Xinhua/Hu Chao)

Photo taken on Feb. 27, 2016 shows the scenery of Dashanbao Black-neck Crane Nature Reserve in Zhaotong City, southwest China's Yunnan Province. (Xinhua/Hu Chao)