these include baboons, macaques, guenons, and their relatives.

The cercopithecines have cheek pouches, in which they store food; 

The Old World monkeys are divided into two subfamilies: Cercopithecinae and Colobinae.

Among the more unusual monkeys are the large and strikingly coloured African drills and mandrills, the proboscis monkey of Borneo, and the rare and bizarre snub-nosed monkeys of China and Vietnam.

The graceful langurs include the hanuman, or sacred monkey, also of southern Asia.

The macaques include the Barbary “ape” of North Africa and the Rock of Gibraltar—the only macaque outside Asia and the only wild monkey inhabiting any part of Europe today—and the rhesus monkey of the Indian subcontinent, which has been used considerably in medical research.

Old World monkeys include many that are often seen in zoos, especially the beautifully coloured African guenons (e.g., mona, diana, white-nosed, green, vervet, and grivet monkeys), colobus, mangabeys, and the chiefly Asiatic macaques.

Some Old World monkeys have been successfully naturalized in Gibraltar, France, Mauritius, Belau, and a few islands of the West Indies.

Old World monkeys live throughout Africa, on the Red Sea coast of Arabia, and in Asia from Afghanistan to Japan and southeast to the islands of the Philippines, Celebes, Bacan, and Timor.

Other New World monkeys include uakaris, sakis, and titis.