People take down this kind of bird's nest, and after refining and selecting it, it becomes the famous bird's nest. "The Golden Swallow nests three times a year, and the first time the nest is thick and white. Because the Golden Swallow has a long winter, it has a long time to rest and recuperate, and has stored enough nutrients in its body, and has a better saliva, so the nests that it builds are better and thicker, and the shape of the nests are excellent, and they become marigold-shaped, which is why they are called marigolds, and they are the finest of all bird's nests.