Many types of monkeys can be found throughout the world. Monkeys originated in tropical and subtropical areas, such as Africa, Asia, Central and South America. They are classified in the same scientific order as apes and human beings. All the various types of monkeys fall into one of two categories, Old World Monkeys or New World Monkeys.Old World monkeys can be recognized by the fact that they have nostrils which are close to one another and point toward the ground. New World Monkeys, on the other hand, have very flat-looking noses and nostrils which are far apart. New World monkeys can grasp and hang by their tails and Old World monkeys cannot.