The monkeys really enjoy eating raw coffee beans (AKA green beans). The only issue is, they can’t actually digest them. So, they chew them up like chewing gum and spit them out on the ground. Rude right? Well this is actually a learned behavior. They’ve learned that coffee foragers look for these, and they’ll actually spit them out in front of their handlers expecting a reward!
This is actually super useful for farmers, as the monkeys used to be viewed as a pest in the coffee fields. The monkeys would ravage the coffee plants and ruin the farmer’s crops. However, after brewing up a cup or five, farmers realized that the beans the monkeys spit out had a particularly sweet flavor to them. Thus, monkey spit coffee was born.