1. Different colors: Guanyan is a kind of bird's nest, and Guanyan is a white bird's nest; bird's nest is a large category, and the colors of bird's nests generally include white and Maroon.

2. Different appearance: In the past, official swallows were special offerings to high-ranking officials, so official swallows generally refer to white bird's nests with better quality and complete cup shape, which are a small part of white bird's nests. ; The quality of bird's nests varies, some are complete and some are damaged, and the quality is different.