Bird’s Nest is the ingredient for a delicacy in Chinese cuisine. A few species of swift, the cave swifts, are renowned for building the saliva nests used to produce the unique texture of this soup.
The edible bird’s nests are among the most expensive animal products consumed by humans. The nests have been used in Chinese cooking for over 400 years, most often as bird’s nest soup.
When dissolved in water, the birds’ nests have a gelatinous texture used for soup.
(Source: Compiled from Wikipedia)