More than 3,000 black-headed gulls have returned to Kunming according to Kunming Bird Watching Association. Since the arrival of the first 150 black-headed gulls on October 5, the number of black-headed gulls in Kunming has been increasing every day. Starting 1985, black-headed gulls have formed the habit of flying from Russia's Siberia to Kunming in winter and leaving Kunming for Siberia in March. Photo by Lin Yiguang