Chimpanzees are one of the few animals that zookeepers and vet staff will actively turn down zoo jobs for. One of my coworkers was telling me about this one chimp she used to work with that feigned sedation when they darted him for anesthesia, and when she walked into his enclosure after they made sure he was asleep, he got up. She was yanked out of the enclosure by the keeper staff SO fast.
Put it like this, gorillas know they can fuck you up but are fairly chill, orangutans know they can fuck you up and will mess with you to get a response, chimpanzees know they can fuck you up and actively think about how they can go about doing it.
This is correct. Gorillas are surprisingly chill, as long as you don't piss them off.