A large group of migratory birds temporarily take up residence in the Beidagang wetland nature reserve, a key stop on their migration paths, in north China's coastal city of Tianjin, Oct. 8, 2015. (Photo: China News Service/Tong Yu)
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A large group of migratory birds temporarily take up residence in the Beidagang wetland nature reserve, a key stop on their migration paths, in north China's coastal city of Tianjin, Oct. 8, 2015. (Photo: China News Service/Tong Yu)
