What's the cackling sound in the grave robbery notes?

First of all, the cackling is made by a cockscomb snake.

Second, the original text is as follows:

1, Tomb Raider Notes Volume V-Lost in the Sea wrote:

I couldn't believe my eyes and patted my head: "So you have been following us! Lord Zhuo Ma told us this news-don't-"

"Yes, that's what I asked her to tell you temporarily. In desperation, I have no other way. It's a long story. " Wen Jindao climbed into the gap, made a gesture with his hands folded, put it to his mouth as a microphone, and made a series of "giggle" sounds.

I wonder what she is doing. Is she greeting those snakes? I heard the cackling echo coming from the depths of the gap. After a while, someone squeezed out from the inside. When I saw it, I found it was a stuffy oil bottle.

2. The tomb raiding notes, Joan Long Shiying, Volume 7 writes:

That thing has a thick wrist, staring curiously at the cold fireworks, bloody and red.

Clearly see a cockscomb snake.

I'm not surprised at all except that I seem to have a cold sweat. It's normal to have this kind of snake. I'm depressed. I didn't think of it before. I should have realized this possibility when I saw these cans.

This red cockscomb snake, under the gaze of my flashlight, basically ignored my light. It coiled around the cold fireworks, suddenly stood up and gave a few gasps.

I immediately understood what that sound was. It must have heard the little flower's breathing, so it began to imitate. This snake can always imitate the most common sounds made by other creatures.

Third, "Grave Robbery Notes"

1. Notes on Grave Robbery is a novel about grave robbery written by three uncles of Nanpai, which was first published at the starting point. Notes on Tomb Robbery: Episode (I) was released on 20111219. At this point, the series of tomb-robbing notes ended and nine physical books were published. The finale of Tomb Raider Notes is the "ending" that millions of fans have been waiting for for for five years.

2. The series "Tomb Notes" is the representative work of Nanpai's three uncles. It can be said that it is the masterpiece of China's publishing industry in recent years, occupying the first place in the domestic major book sales charts for a long time and being enthusiastically sought after by millions of readers. Nanpai's three uncles are famous for their works in the world and are among the best-selling writers in China.