Why does he have such a premonition? He has no way to know. It seems to be intuition.

"no, they shouldn't be here. These monkeys don't kill."

although Li Tian saw the monkey with three eyes and some fear appeared in his heart, he still shook his head to talk to the batian Jedi.

because when the monkey with three eyes came out, he observed that the tree hole around the monkey came out was very clean and covered by some leaves. When the monkey came out, he still had some fruits in his hand and distributed them to the three little monkeys.

it shows that these monkeys are vegetarian,...