Beijing, March 4 (Youth.cn) - Swans were seeking foods on Kongqi River in Korla, Xinjiang Uygur Autonomous Region. As weather gets warmer, wild swans who stayed at urban area in winter gradually fly back to Bayanbulak. Every mid September, they fly to Korla and leave there between February to March. Data shows that from last winter to this spring, 520 white swans have stayed at Korla urban area. It was their 19th winter in Korla. In the past years, with the improvement of ecological environment of Korla and the strengthen of environment protection measures, the pleasant weather and high quality water source made this place a safer and more comfortable home for swans. Photo/CFP