A New World monkey is a term that refers to the species of primates that are native to the tropical regions of Central and South America and Mexico. They're part of the family Cebidae in the order Primates. Compared to Old World monkeys, they have some unique attributes such as prehensile tails for grasping and hanging, wider noses with side-opening nostrils, and typically, they lack opposable thumbs. Some examples include capuchins, spider monkeys, and squirrel monkeys.