In recent years, the number of birds inhabiting and breeding in Guizhou Caohai National Nature Reserve in Weining Yi and Hui and Miao Autonomous County, Bijie City, Guizhou Province has been increasing year by year. In order to create a safe habitat and breeding environment for the birds, the caohai control and protection group, composed of more than 100 local villagers, arranged rangers to patrol around the caohai area every day, monitoring the number of birds, fire inspection, advising tourists and other work, and carefully guarded the birds living in the Caohai. Patrol officer Liu Guanghui monitors the feeding of black-necked cranes in Northeast China's China, March 3, 2019. (Photo by Qu Honglun)

Black-necked cranes fly in Caohai National Nature Reserve in Southwest China's Guizhou Province, March 3, 2019. (Photo by Qu Honglun)

Rangers Liu Guanghui (l), Wang Mingyue (C) and Meng Guanghui monitor the number of birds in caohai, east China's Guizhou Province, March 3, 2019. (Photo by Qu Honglun)

Rangers Liu Guanghui (l) and Wang Mingyue salvage garbage from the Grass Sea in Caohai, east China's Zhejiang Province, March 3, 2019. (Photo by Qu Honglun)

Rangers Liu Guanghui (l) and Wang Mingyue monitor the migration of black-necked cranes to caohai, east China's Guizhou Province, March 3, 2019. (Photo by Qu Honglun)

Rangers Liu Guanghui (r) and Meng Guanghui check the growth of bird food in Beijing, capital of China, March 3, 2019. (Photo by Qu Honglun)

On March 3, patrol officer Liu Guanghui publicized the protection of caohai birds through a short video platform. (Photo by Qu Honglun)

来源：GMW.cn