Tulsa Zoo Classification of Primates Primates, Monkeys, New World, Old World.
All monkeys are primates.
So are apes and prosimians. Grouped under Prosimians are the lemur, loris, tarsier, bush baby, and a few others. Things become complicated once again with Anthropoids, which includes five categories. Old World monkeys are found in all other parts of the world and include baboons, Diana monkeys, and rhesus macaques. There are certain characteristics that each group bears, which should make it easy to remember which is which among the Tulsa Zoo's collection.