Bird's nest soup is one of the most expensive and sought-after dishes in Chinese cuisine. This delicacy is made from swiftlet nests, which are harvested from caves and cliffs in Southeast Asia.

swiftlets build nests out of their sticky saliva on cave walls and cliff sides, where they raise their young. It's the high cost of these saliva nests that makes bird's nest soup so expensive.

swiftlets build nests out of their sticky saliva on cave walls and cliff sides, where they raise their young. It's the high cost of these saliva nests that makes bird's nest soup so expensive.

In the Philippines, collecting the main ingredient for bird's nest soup, swiftlet nests, is one of the most dangerous jobs in Asia. More from Risky Business In the Philippines, collecting the main ...

The officers burnt the pile of swallows’ nests confiscated mainly ... twigs are held together by dried swiftlet saliva, which is made into a gelatinous soup credited in China with everything ...