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Photo taken on Oct. 30, 2017 shows black-headed gulls at an estuary in Jiaozhou Bay of Qingdao, east China's Shandong Province. An increasing number of black-headed gulls arrived here to spend their winter. (Xinhua/Wang Haibin)
Photo taken on Oct. 30, 2017 shows black-headed gulls at an estuary in Jiaozhou Bay of Qingdao, east China's Shandong Province. An increasing number of black-headed gulls arrived here to spend their winter. (Xinhua/Wang Haibin)