The Family Cercopithecidae consists of Old World monkeys, including baboons, macaques, colobus monkeys, and langurs. They are primarily found in Africa and Asia and are characterized by opposable thumbs, forward-facing eyes, and cheek pouches for storing food. Cercopithecids are generally diurnal and social, living in structured troops with complex hierarchies and communication systems. Their diet is omnivorous, ranging from fruits and leaves to insects and small animals. They play important ecological roles as seed dispersers and are frequently studied for insights into primate behavior, social organization, and evolution.