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A gull flies to eat the food people threw at the Haigeng Dam in Kunming, southwest China's Yunnan Province, Dec. 18, 2019. Lots of gulls migrate to Kunming for the warm weather there in the winter. (Xinhua/Hu Chao)

A gull flies to eat the food people threw at the Haigeng Dam in Kunming, southwest China's Yunnan Province, Dec. 18, 2019. Lots of gulls migrate to Kunming for the warm weather there in the winter. (Xinhua/Hu Chao)