Tell me about geese.

Wild geese are large migratory birds, and the sight of struggling to fly back to their nests every autumn often causes homesickness and sentimentality of wanderers, so poets often use wild geese to express their feelings. For example, in Li Qingzhao's "A Piece of Plum", "The word geese return, and the moon is full of the West Building".

Yan is a migratory bird, which migrates with the change of seasons and likes to enter and leave people's houses or eaves in pairs. Therefore, it is favored by the ancients and often appears in ancient poetry, or cherishes spring and hurts autumn, or exaggerates sadness, or reposes lovesickness, or is sentimental about current events, with rich images and expressive expressions, which are far behind other things.