These monkeys are not good pets as they do bite and throw feces. In captivity they are not happy away from their families and are hard to care for.
They are the smallest monkeys in the world. Their body weight averages about 4 ounces and they grow to around 5 inches tall.
They are considered New World Primates as they originate from Central and South America. (Old World Primates come from Asia and Africa.). New World Primates have tails that can grasp and hold things, while Old World Primates usually have opposable thumbs.