Simiiformes range between little pygmy marmosets to large lowland gorillas. Although not each simiiform can be a monkey. A subset of large simiiformes that deficiency tails and originate from Africa or Southeast Asia are referred to as apes rather than monkeys. One method to provide them with sufficient brain stimulation https://waylonhwcef.pages10.com/the-ultimate-guide-to-monkey-72322091