An animal expert checks on two swans rescued by the local wildlife protection authority in Cangzhou, north China's Hebei Province, Nov. 25, 2020. The two swans had been immobilized and suffering from gastrointestinal diseases when farmers found them in Huanghua City of Cangzhou. They were then given medical treatment and are awaiting recovery at a local wildlife conservation center. (Photo by Fu Xinchun/Xinhua)

Staff members check on one of the two swans rescued by the local wildlife protection authority in Cangzhou, north China's Hebei Province, Nov. 25, 2020. The two swans had been immobilized and suffering from gastrointestinal diseases when farmers found them in Huanghua City of Cangzhou. They were then given medical treatment and are awaiting recovery at a local wildlife conservation center. (Photo by Fu Xinchun/Xinhua)

Staff members check on one of the two swans rescued by the local wildlife protection authority in Cangzhou, north China's Hebei Province, Nov. 25, 2020. The two swans had been immobilized and suffering from gastrointestinal diseases when farmers found them in Huanghua City of Cangzhou. They were then given medical treatment and are awaiting recovery at a local wildlife conservation center. (Photo by Fu Xinchun/Xinhua)