A flock of migratory birds flies over Wolong Lake wetland in Kangping county, Shenyang, Liaoning province, on March 17. Recently, the wetland has seen various kinds of migratory birds visit the wetland to rest and find food as they break from their long journeys. [Photo by Long Lei/Xinhua]

Five migratory birds hover above Wolong Lake wetland in Shenyang, Liaoning province, March 17. [Photo by Long Lei/Xinhua]