Cercopithecidae is a family of primates commonly referred to as Old World monkeys, which includes over 140 species. Synonyms for Cercopithecidae include African monkeys, macaques, baboons, guenons, and langurs. These primates can be found throughout Asia, Africa, and the Middle East, inhabiting a variety of environments including forests, savannas, and urban areas. Old World monkeys are known for their complex social structures, cognitive abilities, and physical agility. They are an important component of many ecosystems and are also used in research studies focused on understanding primate behavior and evolution.