Animals are smarter than we give them credit for. We used to have three English Mastiffs and we built a chain link kennel in the back yard. They were forever getting out. I watched them when they didn't know I was there and they took turns trying to lift the handle kept the kennel closed. They were using their paws, and weren't successful at lifting it. If they had used their noses, they could have gotten it open easier.
We now have a Belgian Malinois who tries to turn the doorknobs in the house with her mouth. She has successfully turned the deadbolt too.
As intelligent as chimps are, I'm surprised that they don't automatically use a double lock deadbolt, that needs keys to open from either side.