Red-billed gulls hover over the Daguan River in Kunming City, southwest China’s Yunnan Province on Thursday. /Chinanews Photo

Recently, nearly 100 red-billed gulls appeared on Kunming's Huanxi Bridge near the Daguan River. /Chinanews Photo

Since October, the gulls have migrated from Siberia to Kunming to reach Dianchi Lake for their winter home. /Chinanews Photo

Each year, about 40,000 wintering gulls join the migration. /Chinanews Photo