Swiftlet's

The swiftlet’s nest is tasty to some people. A swiftlet, which is a type of bird, crafts its nest in caves. The males spit clear saliva. With their tongues, they put it into the shape of the nests on the cave wall. Next, the males and females both put more spit on the wall to make the nests. It quickly hardens and looks like a half bowl. Strangely, one pound of nests is 1,000 dollars each! Chefs in Asia make delicious soup out of the nests because it’s a delicacy to some people.