[InKunming--Kunming] Visitors watch black-headed gulls at the Dianchi Lake in Kunming, capital of southwest China's Yunnan Province, Jan. 10, 2018. (Xinhua/Lin Yiguang)

A girl poses for photos with black-headed gulls at the Dianchi Lake in Kunming, capital of southwest China's Yunnan Province, Jan. 10, 2018. (Xinhua/Lin Yiguang)

A woman poses for photos with black-headed gulls at the Dianchi Lake in Kunming, capital of southwest China's Yunnan Province, Jan. 10, 2018. (Xinhua/Lin Yiguang)

Visitors pose for photos with black-headed gulls at the Dianchi Lake in Kunming, capital of southwest China's Yunnan Province, Jan. 10, 2018. (Xinhua/Lin Yiguang)