To add a redundant word after "birds entering the forest", you can add "chirp". It comes from a poem by Han Shan, a poet of the Tang Dynasty: "Apes come to curl up in the trees, and birds chirp in the forest. The hair is rustling at times, and I am melancholy at the end of the year."
You can also add it yourself according to the meaning of the title. When birds fly into the forest, there are bursts of bird songs, so just add the refrains that express the sounds of birds, such as: chirp, chirp, chirp, hoarse, etc.
Extended information:
Duplicate words are judged based on the shape of the word. There are two elements: the single words that make up the word are the same word; the components of the single word must also be the same. word or radical.
Reduplicated words have unique charm in poetry creation, and their special functions are mainly reflected in three aspects: imageability, accuracy, and musicality.
Reference: Baidu Encyclopedia-Duplicate