The swallow in Yanwoling, Dalian is a migratory bird. 20 12 has been to Dalian. This is a kind of black swallow. Swallow (Swallow) The swallow usually refers to passeriformes, belonging to the family Yanidae, with gray-blue and black feathers. Build a nest with mud and grass. Edible bird's nest, built in Jin Siyan, belongs to Swift, belongs to Swift Family, and is a resident bird. It only immigrates to various countries in Malay Archipelago, especially Indonesia and Malaysia.