For 22 years, Ren Jianguo has been a volunteer worker, protecting thousands of wild ducks on Changbai Island in Jilin City, Jilin Province. /Chinadaily Photo

Every day, he visits the island to feed the ducks and raise awareness about their conservation. /Chinadaily Photo

As a result of the joint efforts of Ren and other volunteers, the island has become a wonderful habitat for the water birds. /Chinadaily Photo