Tourists take photos of black-headed gulls at the Dianchi Lake in Kunming, capital of southwest China's Yunnan Province, November 27, 2009. A great number of black-headed gulls migrate here to live through the winter annually. [Xinhua]

A tourist feeds a black-headed gull at the Dianchi Lake in Kunming, capital of southwest China's Yunnan Province, November 27, 2009. A great number of black-headed gulls migrate here to live through the winter annually. [Xinhua]