Most monkeys live in the forests of tropics and subtropics where food is abundant year round. Prehensile tails, which differentiate them from apes, assist them in climbing and getting food. Monkeys have grasping hands, forward-facing eyes, and highly developed brains, classifying them as primates. Three families of monkeys are: marmosets, capuchin-like monkeys and Old World Monkeys. The first two families are South and Central America natives, whereas, the latter are Africa and Southern Asia inhabitants.