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Tourists view black-headed gulls on bank of Erhai Lake in Dali, southwest China's Yunnan Province, on Nov. 8, 2018. (Xinhua/Yang Zongyou)

Tourists view black-headed gulls on bank of Erhai Lake in Dali, southwest China's Yunnan Province, on Nov. 8, 2018. (Xinhua/Yang Zongyou)