The bird's nest is a nest made of swallows, but this kind of swallows is not a common swallow that nests under the eaves. Swallows under the eaves belong to the family Swallow. Their nests are made of grass or mud and saliva, which makes them inedible and has no nutritional value. Edible bird's nest is made of another kind of swallow, which belongs to swiftlet family and is called "Jin Siyan". Specifically, it refers to the nest made of saliva secreted by some Swifts of Swiftlet family of Swiftlet order and several Jin Siyan species of Swiftlet genus, and then mixed with other substances (such as feathers), rather than the nest made by birds of passerine family (such as Ruyan). Among them, Jin Siyan saliva has the highest protein purity and nutritional value. Produced in the southern coastal areas of China, Viet Nam, Thailand, Malaysia, Indonesia and the Philippines. Bird's nest is divided into "house swallow" and "cave swallow" according to the nesting place. The nest of "House Swallow" is generally built on a specially constructed swallow house, the purpose of which is to facilitate the collection of bird's nest, while the nest of Dongyan is built in a cave, with steep terrain and quite dangerous collection. There are "blood swallows" in the bird's nest, because Jin Siyan's food contains seaweed and other things, which makes its saliva contain impurities, so it is named as red silk, not because people misunderstand that it has not completed the bird's nest, refraining from laying eggs and vomiting blood. After the bird's nest is picked, it has to undergo complicated processing such as steaming, soaking, removing impurities, picking hair, drying, etc. before it can be made into finished bird's nest, including Yanzhan, Yantiao, Yanbing and Yansi. Among them, swallow cup is a large and high-quality bird's nest, which is formed by removing impurities and retaining its original shape, and the price is particularly expensive. Jin Siyan's lair. Most of them are built on the cliffs of tropical and subtropical islands. Below the cliffs are rolling waves and above them are blue sky and white clouds. Jin Siyan began to make nests in spring, and its mouth can secrete a kind of colloidal saliva, which is dried by the sea breeze and becomes a translucent and slightly yellowish substance, which is the main component of bird's nest. Jin Siyan made a nest with this saliva, slender seaweed, down feathers and soft plant fibers, which is what we call "bird's nest". Bird's nest is a precious delicacy, and it is also a valuable medicinal material. It has the effect of tonifying lung and nourishing yin, and is mainly used for treating cough and hemoptysis caused by fatigue. India, Malay Archipelago, Hainan Island and South China Sea Islands are all produced. Bird's nest

Bird's nest pays attention to eating less and more meals, and keeps eating regularly. Dry bird's nest is 3-5g each time, and instant bird's nest is 2-3g each time, once in the morning and evening or once every day or every other day. Bird's nest food pays attention to "clear with clear, soft with soft." Generally, during eating bird's nest, eat less spicy and greasy food, and do not smoke or smoke less. Don't eat bird's nest during a cold because the human body can't absorb bird's nest nutrition well.

bird's nest, as the name implies, is the nest of swallows. However, it is not the nest of ordinary swallows, but the nest of a special kind of swallows-Jin Siyan. Swiftlets are birds, swift family. It is a migratory bird that flies from Siberia and other places to natural caves along the tropical coast from December to March every year to reproduce. Jin Siyan is smaller than the swallows we usually see. Its back feathers are grayish brown with golden luster, its wings are pointed and long, and its four toes grow forward. There are well-developed mucus glands in the throat of this swallow, and the saliva secreted can be solidified into solids in the air, which is the main material for their nesting. Jin Siyan lays eggs in March and April every year. Before laying eggs, they fly on the sea and high altitude every day, sometimes up to several kilometers, break through clouds and fog, suck rain and dew, and eat insects, algae, whitebait and other things. After digestion, we drill into steep, shady and high-altitude cliff cracks and deep caves, and spit to build nests. It will take about 2 days to build. The bird's nest in Yanwu

The bird's nest is half-moon-shaped, shaped like a human ear, with a diameter of 6-7 cm, a thick base and a thin profile wall, and weighs about 1-15 grams. The nest is neat in the periphery and rough in the interior, like a loofah network. The whole bird's nest is white, glittering and translucent, elastic and attached to the rocky cliffs. It has always been known as "rare and famous medicine" and "oriental treasure". The nest built by Jin Siyan for the first time is completely condensed by a large amount of mucus secreted by their throats. It is pure and hairless. This kind of bird's nest has the best quality and is the top grade of bird's nest. In the feudal dynasty, it was often chosen as a tribute, so it was named "Guan Yan". After the bird's nest pickers seized the opportunity to pick the bird's nest, Jin Siyan had to make a nest for the second time. Because the spawning season was near, Jin Siyan was plump and had a lot of jelly in his throat, and the nest he built was relatively fat. However, due to time constraints, they brought feathers, grass ... and mixed with the jelly in his throat to build a nest again, which was rough, containing more impurities and poor nutrients. The bird's nest collected at this time is called "Maoyan". Another kind of bird's nest is moistened by the red liquid oozing from the attached red rock wall, which is dark red all over, also called "blood swallow" or "red swallow". It contains some minerals, has good nutrition and little yield, and is regarded as a treasure in bird's nest.

According to the nesting sites in Jin Siyan, it can be divided into cave swallow and house swallow. Dongyan: It is the nest made by swallows in wild caves and coastal cliffs. The living environment of Siyan was destroyed due to early disorderly indiscriminate mining and excavation. Now, only bamboo ladders used for picking are left in some caves in Thailand, and swallows have long been few. With the scarcity of Dongyan production and the growing voice of environmental protection, they are gradually replaced by house swallows. Wu Yan: From Dongyan to Wuyan, the nesting environment in Jin Siyan has changed, but the living habits have not changed. Jin Siyan is still wild. It goes out for food in the morning and comes back in the evening. Due to the artificial protection, Jin Siyan has multiplied more and more, and the built bird's nest has been picked in time, so the nutrients are not lost, and the quality is better than Dongyan. The original ecological house bird's nest combines the advantages of "house swallow" and "hole eye". The combination of nature's virgin forest environment and "house swallow" technology has effectively solved the internal and external environmental problems of bird's nest quality, and formed a unique original ecological house bird's nest, which is natural, fresh and clean. Color: Blood Swallow, Yellow Swallow and Bai Yan. According to the specifications, it is divided into: Yan Zhan, Yan tiao, Yan Si, Yan Bing, Yan Broken and Yan Jiao. Bird's nest

According to the production form, grass swallows: small in size, thumb-sized, with small flying range, and poor in texture. Some grass swallows contain nylon grass, which is actually caused by indigestion in plastic bags. High-quality grass swallows are mainly shredded swallows, while inferior grass swallows have impurities and coarse taste. Grass swallows are wild swallows, and they have strong adaptability to various environments. They are used to picking grass shreds and spitting out their own saliva to build nests. When the grass is broken and saliva condenses, it becomes a nest for raising the next generation. Therefore, the bird's nest built by this swift is covered with grass scraps. Therefore, it is easier to distinguish grass swallows than other kinds of bird's nest, and basically "there is grass." This kind of swallow is common in Sulu Sea in the south of the Philippines, so it is also called Philippine grass swallow. Maoyan: The bird's nest, directly picked and untreated, is called Maoyan because it is mixed with many feathers from Jin Siyan. This hairy swallow is different from the high-quality house swallow that has just been picked with a little hair, both in the swallow house and in the wild, and the difference is great. The light hairy swallow can be turned into a piece of swallow strips after unhairing, and the heavy hairy swallow used to be wrapped in silk stockings to dissolve the bird's nest, but now it is broken and then unhairing and adding working swallow cakes or swallows. Some hairy swallows need to use chemicals because of many impurities, unpleasant colors or re-bonding, so there are few impurities, even if they are hairy, but no chemicals are used. According to the shape: the swallow cup is intact. After the hair picking treatment, the swallow cup is clean, with less impurities and good color. According to the completeness of the cup shape, Bai Yan cups can be divided into different grades, among which the super Bai Yan (Longya) is the best grade-the cup shape is big and perfect, and the fiber is tight; There is also a triangular swallow, which is triangular, and is Jin Siyan's bird's nest built in the corner of the Yanwu. In the process of plucking, packaging or transportation, many complete swallow cups are crushed and cannot form a cup shape. Those thick bird's nests are called swallow bars. The taste of Yan tiao is slightly worse than that of Yan Zhan, but its nutritional value is the same. Because it has no cup shape and poor sales, its price is lower than that of Yan Zhan. Bird's nest

Swallow silk Swallow silk is the thin strips that the workers shed when picking wool, which are packaged after concentration. Because its shape is smaller than that of swallows, it is called filiform. The taste of shredded Yan is worse than that of Yanzhan and Yantiao, and it is very broken after stewing, with more impurities than Yanzhan. The price is lower, which can meet the needs of low-priced consumer groups. There are also swallow nets, balls, pieces and pieces made of swallow silk. During the processing, most of them are made of edible adhesive, so the price is lower. When the swallowtail corner is trimmed, the irregular part of the swallowtail corner is trimmed and angular, so it is called swallowtail corner. Because the swallow horn is the corner of the swallow cup, the texture is relatively hard, so it is more chewy, but the hair is small and the soaking time is longer, usually more than 1 hours.