You may have thought things like currency or money are concepts known solely to man. Some might have a sense of ownership, besides of course territory, but trading and the likes haven’t been observed in any other species besides humans.
An economist/psychologist duo from Yale back in 2005, however, managed to train seven capuchin monkeys how to use money, and I’m pretty sure from here on some of you might be able to guess what happened from there on.
Monkeys were given silver discs, which they traded for goods such as apples, grapes and many other things. When this experiment became interesting, was when the scientists noticed two monkeys having sex, once they were done, the male monkey gave the female some silver discs!
They were also thought how to gamble and committed the same mistakes humans do when gambling.