Introduction to birds: The birds in Qilihai can be divided into 21 species of resident birds, 100 species of migrant birds, 34 species of summer migratory birds, and 27 species of winter migratory birds. The resources are huge. The oyster beach is the largest, most widely distributed, and most clearly sequenced ancient coastal relic discovered in the world so far. It is of great value to the study of oceanography, wetland ecology and other disciplines.