Koko (gorilla) once blamed something on the cat. Another time when Penny (the researcher) had a guest, Koko got into the guest's purse and stole a lipstick. She then created art on a wall. When Penny asked her what happened, Koko signed "Michael did it." Michael was (he's dead now) another gorilla at the center.<quoted text>
You don't know much.
Primates can use sign language and form sentences, and the research into it shows they even show a concept of language and create sentences they never were taught. They also know how to lie to cover their misdeeds.
Speaking of Michael, he was rescued from poachers who had taken him from the bush when he was like two. Talking to Penny one day he described watching the men with guns kill his mother and cut her head off. That was like 20 years after the fact. So, yeah just as smart as cats and dogs./eyeroll