I guess the proper term for monkey balls would be monkey cereal balls but that’s not what we call them in our house. They’re a pretty healthy snack but can also be fed as part of their main diet. Creativity is key when creating monkey balls. As long as you have the two main ingredient (baby formula and baby cereal) in your mix, you’re golden! I used to feed monkey balls to my marmosets and now my capuchin and they truly enjoy it. I actually got the original recipe (similar to mine but not as creative) from one of the largest zoos in Belgium. They used to feed these monkey balls to all their primates.