Bird nest can be referred as The caviar of the East, due to it is treasured food and is high price. Bird nest in chinese named Yan Wo, it built by a small bird called Swallow. The nests are built from the swallows's salivary secretion which is abundant, particularly during breeding season.

These nests, often found clinging to the ceilings of caves as high as two hundred feet, are built by both parents expressly for raising their young. When the hatch lings are ready to fly off, the nests, found in many coastal caves of South East Asia including Borneo, Malaysia, Indonesia, Thailand, and Vietnam, are then abandoned.

Bird nest traditionally consumed in soup, edible birds' nests are now being turned into food and drink additives as well as put into cosmetics. Bird’s Nest is reputed to maintain youthfulness and enhance the complexion. Modern studies have shown that Bird’s Nest is rich in epidermal growth factor(EGF). This substance is responsible for skin and tissue repair.