Wild geese fly over the Jingxin wetland in Hunchun City, northeast China's Jilin Province, March 3, 2020. Tens of thousands of migratory birds flying back towards north pass by Jingxin wetland and forage here. (Xinhua/Xu Chang)

Wild geese fly over the Jingxin wetland in Hunchun City, northeast China's Jilin Province, March 3, 2020. Tens of thousands of migratory birds flying back towards north pass by Jingxin wetland and forage here. (Xinhua/Xu Chang)

Wild geese fly over the Jingxin wetland in Hunchun City, northeast China's Jilin Province, March 3, 2020. Tens of thousands of migratory birds flying back towards north pass by Jingxin wetland and forage here. (Xinhua/Xu Chang)

Wild geese fly over the Jingxin wetland in Hunchun City, northeast China's Jilin Province, March 3, 2020. Tens of thousands of migratory birds flying back towards north pass by Jingxin wetland and forage here. (Xinhua/Xu Chang)