Bird's nest, we have all heard of it, and you may have eaten it before, but is it really made by swallows? As a matter of fact, many people are familiar with swallows as "house swallows", which are commonly found in China, India, Europe and North America. Their nests are made of twigs, grass and mud, and are not edible. Bird's nest in Southeast Asia, there is a special kind of swallows, called "Golden Swallow", they have very developed mucus glands in their throat, and the saliva secreted can be condensed into a solid in the air, so the Golden Swallow uses its special saliva and mosses, seaweeds, and its own feathers, and there are also some soft plant fibers to make the nest, which is what we call the "Bird's Nest". This is what we call "Bird's Nest". The real edible bird's nests are made from the saliva of several species of swiftlets in the family Apodidae. The swiftlet is not the same species as the house swallow, nor is it the same species, nor is it the same order. Although it is smaller in size than the swiftlet, with a body length of only about 18 centimeters, it is incredibly tenacious in its ability to build nests and raise its brood. The swiftlet naturally condenses its saliva in the shape of an ear, which is the Oriental treasure - the bird's nest. When this swallow eats it, the flesh melts but not the ribs, and the saliva is vomited out. Bird's nest has high edible and medicinal value. According to the "Food Composition Table" compiled by China Institute of Medical Science and Hygiene and "Bird's Nest Examination" co-authored by Prof. Guan Peisheng and Prof. Wang Runxiang of Department of Biochemistry of The Chinese University of Hong Kong, bird's nest contains 49.9% protein, a large number of biologically active protein molecules, as well as vector fats, and phosphorus, sulphur, calcium, potassium and other components of the human body has a nourishing Yin and rejuvenating effect. Bird's nest, also known as bird's nest, bird's nest root, fruit pulp, bird's nest text, bird's nest, golden silk, etc., which is both a valuable cooking raw material and a tonic with high nutritional value. Ming Dynasty Li Shizhen compiled "Compendium of Materia Medica", the bird's nest has a more detailed description: "Min of the far sea near the Fan, there are swallows named Jinshi. The head and tail are like swallows but very small, and the hair is like gold threads. When the eggs are being nurtured, the group flies into the sand and mud with stones, and pecks the silkworms and snails to eat. There are inquiries about the sea merchant, heard of the Tufan cloud, silkworm snail meat on the back of two ribs such as maple silkworm silk, clean and white, eaten to replenish the deficiency loss, has been labor dysentery. Bird's nest belongs to the pulp, just collected under the bird's nest is relatively fresh and nutritious.