Photo taken on Nov. 8, 2018 shows the scenery of Erhai Lake in Dali, southwest China's Yunnan Province. (Xinhua/Yang Zongyou)
Black-headed gulls rest at Erhai Lake in Dali, southwest China's Yunnan Province, on Nov. 8, 2018. (Xinhua/Yang Zongyou)
Photo taken on Nov. 8, 2018 shows Xingsheng bridge over Erhai Lake in Dali, southwest China's Yunnan Province. (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)
Photo taken on Nov. 8, 2018 shows the scenery of Erhai Lake in Dali, southwest China's Yunnan Province. (Xinhua/Yang Zongyou)