Any of about 12 primarily Asian species of omnivorous, diurnal monkeys (genus Macaca) with cheek pouches for carrying food. Some species have long tails, some have short tails, and some have none. Males are 16–28 in. (41–70 cm) long (excluding the tail) and weigh 12–40 lb (5.5–18 kg). Troops live in mountains and lowlands and along shores. The rhesus monkey (M. mulatta) has been important to medical and psychological research. Malays train pig-tailed macaques (M. nemestrina) to pick coconuts. See also Barbary ape; bonnet monkey; Celebes black ape.

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