Black-headed gulls fly at the Green Lake Park in Kunming, capital of southwest China's Yunnan Province, Dec. 18, 2016. Every year, black-headed gulls migrate to Kunming to live through the winter. (Xinhua/Lin Yiguang)
Black-headed gulls fly at the Green Lake Park in Kunming, capital of southwest China's Yunnan Province, Dec. 18, 2016. Every year, black-headed gulls migrate to Kunming to live through the winter. (Xinhua/Lin Yiguang)
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