According to the nesting site in Jin Siyan, it can be divided into cave swallow and house swallow;
By color: blood swallow, yellow swallow, Bai Yan; According to the specifications, it is divided into: Zhan Yan, Yan tiao, Yan Si, Yan Bing, Yan Sui and so on.
Jin Siyan can build nests two or three times a year. The first time, the quality is the best, almost all of them are formed by saliva condensation. The second and third passes were mixed with impurities and the quality was poor. There are three ways to choose bird's nest: seeing, smelling, touching and burning.
Depression can eat bird's nest. You can choose Tong Ren Tang and Fulinmen Bird's Nest, both of which are very reliable. The price of Tong Ren Tang is about three times that of Fulinmen, which is more suitable for home use.