Black-necked cranes are seen at the Dashanbao state nature reserve of black-necked cranes in Zhaotong, Southwest China’s Yunnan province, Feb 16, 2017. The nature reserve, established in 2003 for the endangered species, has seen increased number of black-necked cranes winter here in recent years.[Photo/Xinhua]

Black-necked cranes are seen at the Dashanbao state nature reserve of black-necked cranes in Zhaotong, Southwest China’s Yunnan province, Feb 16, 2017. The nature reserve, established in 2003 for the endangered species, has seen increased number of black-necked cranes winter here in recent years.[Photo/Xinhua]

Black-necked cranes are seen at the Dashanbao state nature reserve of black-necked cranes in Zhaotong, Southwest China’s Yunnan province, Feb 16, 2017. The nature reserve, established in 2003 for the endangered species, has seen increased number of black-necked cranes winter here in recent years.[Photo/Xinhua]

Black-necked cranes are seen at the Dashanbao state nature reserve of black-necked cranes in Zhaotong, Southwest China’s Yunnan province, Feb 16, 2017. The nature reserve, established in 2003 for the endangered species, has seen increased number of black-necked cranes winter here in recent years.[Photo/Xinhua]

Black-necked cranes are seen at the Dashanbao state nature reserve of black-necked cranes in Zhaotong, Southwest China’s Yunnan province, Feb 16, 2017. The nature reserve, established in 2003 for the endangered species, has seen increased number of black-necked cranes winter here in recent years.[Photo/Xinhua]