The bird's nest is a kind of bird called "Jin Siyan", which is cemented by mixing their feathers and saliva with fresh moss, seaweed and soft plants.

People take this kind of bird's nest down, and after refining and selecting it, it becomes a valuable bird's nest. "Jin Siyan" nests three times a year, and the first nest is thick and white. Because Jin Siyan has a long winter and has a long time to recuperate, it stores enough nutrients in its body, and the quality of saliva is better, so the nest built is better and thicker, and it is shaped like a lamp, so it is named Yanzhan, which is the best in bird's nest.