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Tourists feed the black-headed gulls near the Dianchi Lake in Kunming, southwest China's Yunnan Province, Feb. 21, 2018. Every year in autumn and winter, black-headed gulls flew to Kunming for warmer weather. (Xinhua/Hu Chao)

Tourists feed the black-headed gulls near the Dianchi Lake in Kunming, southwest China's Yunnan Province, Feb. 21, 2018. Every year in autumn and winter, black-headed gulls flew to Kunming for warmer weather. (Xinhua/Hu Chao)