Bird's Nest is the saliva of swallows, which is basically a nest formed by condensation of saliva of Swift family and its genus Jin Siyan.

To sum up, there are about 90 species of swallows, and not all bird's nests are edible.

Our common nests made of branches, grass and mud under the eaves must not be eaten.

The "Edible Bird's Nest" was built by Jin Siyan, Mao Yan and Cao Yan with their saliva.