In ancient poetry, what emotions did the ape whistle express?

Its ape sound is also sad, in ancient poetry. Generally, the howl of an ape is used to express the sad and embarrassing mood.

such as

Listen to apes whistle and watch birds fly back.

-The ape sang three times, tears streaming down her face.

My residence is near the town by the river, low and humid, and the house is surrounded by bitter reeds and yellow rushes.

What can you hear here in the morning and evening? ? The cuckoo's bleeding cry, the ape's sobbing.

I often pick up the wine and drink it alone in the spring morning with flowers and the autumn night with moonlight.