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Classification and difference of bird's nest What is the classification and difference of bird's nest?

1. According to the quality, bird's nest can be divided into official bird's nest, hairy bird's nest and grass bird's nest. The official bird's nest is a first-stage bird's nest without impurities and has a good taste. Maoyan contains a small amount of impurities, generally the second and third stages of bird's nest, while Caoyan contains a large number of impurities such as weeds and swallow hair.

2. The most common classification is based on color and bird's nest size. If the classification is based on color, it can be divided into four grades: Blood Swallow, Jin Siyan, Bai Yan and Huangyan. Among them, Blood Swallow has the best quality and is extremely rare. It is the best bird's nest species, and the difference of bird's nest color is determined by geographical environment and climatic conditions.