Tire swings, climbing ropes and toys must be replaced constantly as the monkey grows bored. A monkey's environment must also be warm, dry and free from drafts. Monkeys like to sunbathe for short periods and need the vitamin D from the sun, so they must be provided with both indoor and outdoor caging with shade. If this is impossible, vitamin D must be provided orally or through the use of special vita-lights. Monkeys cannot live on peanuts and bananas alone.
Some species have peculiar dietary needs, but all primates require a well balanced diet.
This can include a foundation of commercial primate biscuits supplemented by lots of fresh vegetables, fruits, vitamins and live insects. If you like to take vacations, don't get a monkey. If a monkey is left alone each day, even for just a few hours, it can suffer psychologically and may develop aberrant behavior. To keep it company, you must consider adding another of its species or perhaps keeping a small troupe of monkeys to nurture and communicate with one another. Many vets know very little about primates, and some won't accept primates as patients.