There are currently 264 known monkey species which can be divided into two groups - Old World monkeys that live in Africa and Asia, and New World monkeys that live in South America. A baboon is an example of an Old World monkey and a marmoset is an example of a New World monkey. Your image needs to be of monkeys only, and don't forget that apes are not monkeys. Remember - a monkey will usually have a tail where as apes don't.
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