[InKunming--Kunming]  Black-headed gulls fly over the Haigeng Levee of Dianchi Lake in Kunming, capital of southwest China's Yunnan Province, Jan. 22, 2015. Many local citizens come to the levee to view black-headed gulls on Thursday as the temperature is moderate and the air is clear.

People enjoy themselves with black-headed gulls at Haigeng Levee of Dianchi Lake in Kunming, capital of southwest China's Yunnan Province, Jan. 22, 2015. Many local citizens come to the levee to view black-headed gulls on Thursday as the temperature is moderate and the air is clear.

Black-headed gulls fly over the Haigeng Levee of Dianchi Lake in Kunming, capital of southwest China's Yunnan Province, Jan. 22, 2015. Many local citizens come to the levee to view black-headed gulls on Thursday as the temperature is moderate and the air is clear.

A black-headed gull flies over the Haigeng Levee of Dianchi Lake in Kunming, capital of southwest China's Yunnan Province, Jan. 22, 2015. Many local citizens come to the levee to view black-headed gulls on Thursday as the temperature is moderate and the air is clear.

Photo taken on Jan. 22, 2015 shows reflection of two black-headed gulls on the Haigeng Levee of Dianchi Lake in Kunming, capital of southwest China's Yunnan Province. Many local citizens come to the levee to view black-headed gulls on Thursday as the temperature is moderate and the air is clear.