Simiiformes vary from very small pygmy marmosets to big lowland gorillas. But not every simiiform is actually a monkey. A subset of large simiiformes that lack tails and come from Africa or Southeast Asia are termed apes instead of monkeys. Maintaining a Marmoset is like aquiring a boy or girl. https://jeffreyvzwsk.blogdanica.com/37082883/monkey-things-to-know-before-you-buy