"In almost all aspects, capuchins manage to understand money and use it in a manner not too different from plain old Homo Sapiens. ..."
How scientists taught monkeys the concept of money. Not long after, the first prostitute monkey appeared
https://www.zmescience.com/research/how-scientists-tught-monkeys-the-concept-of-money-not-long-after-the-first-prostitute-monkey-appeared/