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 A triangle pointing right which ...

It is reported the swiftlets prefer to make their nests in colonies ... and are being illegally exported due to the high demand for them. These nests are used to make a soup by soaking and steaming ...

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 ...