What emotions do apes scream to express in ancient poems?

From the Tang Dynasty poet Du Fu's "Ascending the Mountain"

The wind is fast and high, the ape cries sadly, and the birds are circling in the white sand.

The endless trees are rustling leaves, and the Yangtze River is rolling unpredictably.

Li in the sad autumn scenery, a wanderer all the year round, lives alone on the high platform in today's illness.

After all the hardships and hatred, the white hair is full, and the wine glasses are damaged.

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This song was written by Du Fu when he was in Kuizhou in the second year of Dali (767). The bleak autumn is vividly written by the poet, and the emotions aroused are even more touching. This is not only because of the natural autumn, but also because of the poet's strong emotional color for the autumn of life. Couplets are vivid, which is a famous sentence spread in later generations. The two 14-character sentences in the neck couplet contain multiple meanings and describe the hardships of life, which makes people feel strong sympathy.