Old World monkeys are primates in the family Cercopithecidae. Twenty-four genera and 139 species are recognized, making it the largest primate family. Old World monkey genera include baboons, red colobus, and macaques. Common names for other Old World monkeys include the talapoin, guenon, colobus, douc, vervet, gelada, mangabey, langur, mandrill, drill, surili (Presbytis), patas, and proboscis monkey.