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The rhesus macaque (Macaca mulatta) is one of the best-known species of Old World monkeys Adult males measure about 53 cm (21 in) on average and weigh about 7.7 kg (17 lb). Females are smaller, averaging 47 cm (19 in) in length and.
Rhesus macaques live in large, multi-male/multi-female groups that have an puberty between three and 3.5 years of age but do not reach adult body size until .