In Dandong City, Liaoning Province, the first wave of waterbirds this year is coming. As the tide is surging towards the shore, flocks of birds in distance are flying upward and downward from time to time, forming the unique and amazing wave of waterbirds with tens of millions of them together in the air in different formations. The “bird wave” surging like the tide mainly consists of two birds, Limosa lapponica and Calidris alpina. When it is close to high tide, waders will stay at the intertidal zone between waterline and dykes and dams. The visitors standing on the seaside dykes and dams of Haijiao Road can watch the impressive scene of “bird wave”.