There was once a report on genetic research that stated humans share a very high similarity with chimpanzees, only differing by about 1-2%. However, it's this 2% difference in genes that leads to significant disparities in intelligence, behavior, and psychology between chimps and humans, embodying the saying, "A miss is as good as a mile."
But this does not mean chimpanzees and monkeys are stupid. Compared to many other animals, they are quite clever.
Those monkeys watched Zheng Tan twist the bottle cap open, tighten it, open it again, and tighten it repeatedly. After a few times, they probably got an itch to try themselves. Zheng Tan, thinking they had seen enough demonstration, put the bottle back on the ground and took a few steps back.