Bird's Nest is a kind of bird called Jin Siyan, which eats moss, seaweed, insects, whitebait and so on. Then mix their feathers with saliva and condense them into solids in the air. This is not only Jin Siyan's hiding place, but also a natural way to eat bird's nest. After that, people will choose this bird's nest, refine it, select it and finally sell it to users.
The blood swallow is made of Jin Siyan with a brown tail. Compared with ordinary Jin Siyan, this Jin Siyan is in a different environment. The water in its habitat and the wall of bird's nest contain high content of iron, which makes its saliva red and bird's nest bloody.
There are three kinds of bird's nest: cave swallow collected from nature, domestic swallow artificially raised indoors and processed bird's nest. In addition, there are artificial bird's nest made of seaweed and fake bird's nest made of starch. This kind of fake can almost be confused with the real one, so to identify bird's nest, we must first distinguish between true and false, and then classify and grade it.
Collection method of bird's nest
It is usually collected in February, April and August, and Jin Siyan lays eggs in April every year. Before laying eggs, it must build a new nest. At this time, the mucus glands in its throat are very developed, and the nest built is made of mucus, which is white and clean, and is called "Bai Yan".
When Jin Siyan builds a nest, in order to make the nest strong, he usually adds his own feathers to the nest built with saliva, so that his nest can protect the growth of the cubs.
After picking the bird's nest, bird's nest pickers usually pick off their hair to make the finished bird's nest look more beautiful. However, some merchants sell the picked bird's nest without picking hair. This kind of bird's nest is called Mao Yan, also called Mao Yan.