Combined with the text, talk about the aspects of laughter.

Combined with the text, talking about laughter is manifested in:

It is ridiculous for the author to study the external behavior of animals. For example, the author pretended to be "mother duck" and squatted, crawled and shouted on the grass. ...

The naughty behavior of small animals is ridiculous. The ducklings hid in the deep grass without trace, as if they didn't want to tell people what had happened. The parrot bit off all the buttons on his father's clothes, causing the old man to bend over and stumble with pants in his hand. ...

3. The language of the article is humorous, sometimes with the taste of ridicule, which makes me feel very funny after reading it. "A joke" points out the main content of the article.

Content understanding:

(1) The madness of "I" is mentioned many times in the article. How do you understand the madness of "me"?

Clear: "I" focuses on the study of animal behavior. In order to seek the truth, I often need to mix with animals regardless of my dignity. It is easy for people who don't know why to regard my behavior as grotesque or crazy. In fact, the madness of "I" just reflects my concentration, persistence and selflessness in animal research.

(2) The author has established a very close relationship with animals. How is this intimate relationship established? Try to explain in detail with the content of the text.

Clear: For example, after the ducklings hatch, the author imitates the voice of the female water duck and keeps barking. These ducklings are not afraid of the author at all. They looked at the author with trust, curled up together and let the author take them away with a voice. The author squatted, crawled and shouted with the ducklings on the green grass in the garden, and became one with the ducklings.