I mean they did the same shit with capoochin monkeys in captivity and colbert covered part of it in like 2006 on his parody show. Apparently they would use jello as a form of currency with the monkeys, but it backfired when the female monkeys would offer sexual favors to anyone and anything in exchange for it, including some of the zoo-keepers who would later be sentenced to 20 years in jail for that stuff.