What is the whole poem "Crow knows how to feed back"? What's the name of this poem?

Poetic title; Crying at Midnight (Tang; Author; Bai Juyi)

Original text; The second time I lost my mother, I vomited because I was dumb. Don't fly day and night, keep the old forest old. Crying in the middle of the night every night, everyone who smells it will be moved. If you tell me in your voice, you won't give back to your heart. A hundred birds have no mother, but they are very sad. What makes you sad should be your mother's kindness. Once upon a time, there was a Wu Qizhe whose mother died. What disciple, the heart is not as good as a bird. The second thing gives the second thing, and the bird once applied.

(1) The lamb kneels and suckles, and the crow feeds back, which is the foundation of life and filial piety to parents.

(2) Young birds are strong and can fly, but they eat and feed back, "Bird Fu for Beginners"

(3) Sheep have the grace of kneeling and nursing, while crows have the meaning of feeding back.