Cercopithecidae, commonly known as Old World monkeys, is a family of primates that includes species such as macaques and baboons. These monkeys are primarily found in Africa and Asia and are characterized by their long tails, which are often not prehensile, and their narrow nostrils. They typically have a diverse diet that includes fruits, leaves, and insects. Members of the Cercopithecidae family are known for their social structures, often living in large troops. They exhibit a range of behaviors and adaptations, making them highly adaptable to various environments. Their evolutionary history is closely linked to that of other primates, including apes and humans.