Migratory birds fly over Bayanbulak Wetland in northwest China's Xinjiang Uyghur Autonomous Region in Spring. (Photo/China News Service)
Migratory birds fly over Bayanbulak Wetland in northwest China's Xinjiang Uyghur Autonomous Region in Spring. (Photo/China News Service)
Migratory birds rest at Bayanbulak Wetland in northwest China's Xinjiang Uyghur Autonomous Region in Spring. (Photo/China News Service)
Swans rest at Bayanbulak Wetland in northwest China's Xinjiang Uyghur Autonomous Region in Spring. (Photo/China News Service)
Swans fly over Bayanbulak Wetland in northwest China's Xinjiang Uyghur Autonomous Region in Spring. (Photo/China News Service)
