Photo taken on Feb. 28, 2016 shows black-necked cranes flying at the Dashanbao Black-neck Crane Nature Reserve in Zhaotong City, southwest China's Yunnan Province. After returning farmlands to grasslands and wetlands, the Dashanbao Black-neck Crane Nature Reserve, which was built in 2003, has seen the number of black-necked cranes that winter here increase from 300 to about 1200 in 2015. (Xinhua/Hu Chao)