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A flock of oriental white storks are seen at Caofeidian wetland, a vital migratory bird wetland habitat in north China's Hebei Province, Nov. 18, 2017. (Xinhua/Yang Shiyao)
A flock of oriental white storks are seen at Caofeidian wetland, a vital migratory bird wetland habitat in north China's Hebei Province, Nov. 18, 2017. (Xinhua/Yang Shiyao)