Slow-moving monkeys or apes with deliberate gestures and occasional eye contact are likely old world primates, whereas jittery monkeys with quick movements are likely new world monkeys.

“If you're at the zoo and you see a slow moving monkey with slow deliberate gestures kind of moves its eyes makes eye contact every once in a while, those tend to be the old world primates, those kind of jittery ones that look like they're really nervous wrapping their tail and kind of hiding there in a little bundle. Those tend to be the new world monkeys, okay.”