When summer comes, people in Dai villages of Menglian county would enjoy the cold sour-ant eggs in sauce which is full of protein and has the function of strengthening the digestive organ, keeping off the hot, eliminating disease. The sour ant is some kind of thin and yellow ant in tropical forests among which the adult ones are with dense sour smell. These ants usually build some round nest in the jungle or tree crotch which are the birth places of white and soybean –shaped ant eggs, the smallest and most fragrant egg in the world. It becomes the first class food for visitors for its rich protein and good taste.