Bird's Nest is made of mucus secreted by Jin Siyan's throat. Jin Siyan's head has well-developed mucus glands, which can solidify into a solid state in the air after being secreted. After Jin Siyan built his own nest through this feature, it showed a half-moon or triangular appearance, which looked like an irregular grid woven from silk.

Bird's nest is rich in amino acids, such as phenylalanine, valine, leucine, tyrosine and arginine. The content of hydrolyzed amino acids in bird's nest is 42.272%, and the content of essential amino acids accounts for 42% of the total amino acids. At the same time, the amino acid content with umami flavor and aromatic flavor is high, which indicates that bird's nest is delicious.

The Bird's Nest is formed by saliva secreted by well-developed mucous glands in Jin Siyan's throat, which condenses into a solid in the air. It is a white bird's nest built by Jin Siyan after eating insects, seaweed, whitebait and other things, so it is called Bai Yan, also known as Yan Guan. The whole bird's nest is relatively white, and naturally it is white with a little yellow.

Yan Huang: The whole bird's nest or most of it is yellow, which is a natural phenomenon. Some bird's nests picked from caves also show uneven brownish red, blood red, brown or brownish yellow, with deep bottom and shallow middle and edges. It needs to be clarified that this color does not come from the blood in the swallow's mouth.