Staff members release migrant birds into the wild at the Poyang Lake national natural reserve in east China's Jiangxi Province, Jan. 14, 2019. Sixteen rare migrant birds, including one oriental white stork, two whooper swans and three mandarin ducks, were released into the wild in Jiangxi on Monday. (Xinhua/Wan Xiang)

Staff members release an oriental white stork into the wild at the Poyang Lake national natural reserve in east China's Jiangxi Province, Jan. 14, 2019. Sixteen rare migrant birds, including one oriental white stork, two whooper swans and three mandarin ducks, were released into the wild in Jiangxi on Monday. (Xinhua/Wan Xiang)

Staff members release a whooper swan into the wild at the Poyang Lake national natural reserve in east China's Jiangxi Province, Jan. 14, 2019. Sixteen rare migrant birds, including one oriental white stork, two whooper swans and three mandarin ducks, were released into the wild in Jiangxi on Monday. (Xinhua/Wan Xiang)

Staff members release migrant birds into the wild at the Poyang Lake national natural reserve in east China's Jiangxi Province, Jan. 14, 2019. Sixteen rare migrant birds, including one oriental white stork, two whooper swans and three mandarin ducks, were released into the wild in Jiangxi on Monday. (Xinhua/Wan Xiang)