According to the species classification of bird's nests, they can be divided into official bird's nest, feather bird's nest and grass bird's nest.

(1) Guan Yan, which began in the Ming Dynasty, is a tribute from the imperial court and is known as "Gong Yan" and "Guan Yan". Yanguan is the best bird's nest because it is fragrant, nutritious and rare in quantity.

Yan Guan is also Ajin’s fourth eye. She builds a nest three times a year on average. The nest built for the first time has a complete lamp shape and the best quality. At this stage, the swallow's nest is almost entirely made of saliva, with only a few young hairs. The second and third official swallows are intact, but their nests have more feathers and impurities. The bird's nest is white in color, smooth in shape, and has a cup-shaped or half-bowl shape.

The common house swallow lanterns and cave swallow lanterns on the market can be classified as official swallow lanterns. And wars and wars can basically be divided into three categories: hot-blooded, swiftlet wars and white wars.

Snow War

(Currently the global market accounts for less than 10%, it is difficult to buy on the market, don’t believe it easily.)

This kind of appearance It is blood red or light red, mostly nests built by swiftlets with brown tails. Because the environment in which brown-tailed swiftlets live has a high content of copper oxide, the food it preys on contains a large amount of iron, causing its saliva to turn light red, commonly known as "blood swallows". In addition, the color of the nest will turn blood red due to food or external environment. Zhanyan has been soaked for a long time, and has a refreshing and solid taste, with a fragrance that is fire-resistant. Because of its low output and high demand, the price of blood bird's nest is higher than that of other types of bird's nest.

Golden silk swallows

(Currently the global market accounts for about 20%, Yan Gongzi’s family only sells this kind of high-quality products)

Golden silk swallows are generally made of gold yellow or yellow. This bird's nest tastes tender and fragrant. The production of swiftlets is less than that of white swallows, and it is only easy to produce them in special island climates. During nesting, the saliva of swiftlets is oxidized by the air and turns golden yellow, somewhat transparent. In addition, long-term sun exposure will also turn the nest into a golden color.

Zhan Baiyan

(Currently, the global market accounts for 70%, and most of them are swallows like this)

Among all kinds of official swallows, white swallows are the most fresh and tender. Not only is the aroma rich, but it also tastes fresh and smooth. Especially for barn swallows, because in barn swallows, the nests are picked in the shortest possible time (on average once every three months). The white rock lamps in the cave have a relatively tight texture, a large expansion force, and an average concentration (sialic acid content).

(2) Maoyan

Maoyan mainly refers to the gray-rumped swiftlet, which is a kind of cave swallow. Its origins include Thailand, Indonesia, Sabah and Sarawak, Malaysia.

Mao Yan likes to build nests with his own saliva and feathers, so this kind of bird's nest contains more feathers and is not as nutritious as Yan Guan's. The nest color is darker and contains more impurities, so the processing technology is complex and the treatment is more difficult. Woolly swallows can basically be divided into two categories: freshwater swallows and saltwater swallows.

Tanshui

Tanshui refers to the feather swallows picked in caves, which are mostly produced in Indonesia, Thailand, Vietnam, Myanmar and other places. The nests of this feathery bird vary in size and contain a lot of feather impurities. The color of freshwater swallows is beige or yellow. The part where the bird's nest connects to the cave, namely Swallow's Corner, is slightly yellow.

Saltwater

Saltwater swallows refer to the feather swallows that live near the coast, also known as petrels, from Indonesia. Because its swallows are red and hairy, the market demand is not high. But people in the industry don't think so, because salt water swallows can be processed into handmade swallows.

(3) Grass swallow

A kind of wild swallow, small in size, mostly distributed in the southern Philippines, also called Philippine grass swallow. They build nests from grass clippings mixed with their saliva. This kind of bird's nest is mixed with a lot of grass clippings, the surface is covered with grass clippings, and the quality is the worst. Therefore, it is particularly easy to identify grass swallows. Basically "there is grass". Therefore, the price of grass bird's nest is cheaper than other bird's nests, and most of the popular ready-to-eat bird's nests on the market are made of it.