<P> Edible bird 's nests are bird nests created by edible - nest swiftlets using solidified saliva , which are harvested for human consumption . They are particularly prized in Chinese culture due to their rarity , and supposedly high nutritional value and exquisite flavor . Edible bird 's nests are among the most expensive animal products consumed by humans , with nests being sold recently at prices up to about US $ 2,000 per kilogram , depending on grading . The type or grading of bird 's nest depends on the type of bird as well as the diet of the bird . It differs in colour from white to dark brown . The Chinese believe that it promotes good health , especially for the skin . The nests have been used in Chinese cooking for over 400 years , most often as bird 's nest soup . </P>
where does bird 's nest soup come from
bird nests created by edible - nest swiftlets using solidified saliva