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BiologyAlthough little is known about the biology of this species, it is likely to share much in common with other squirrel monkeys (6) (8). Most active during the day (2) (9), these small primates feed mainly on fruit and insects, supplemented with other small animal prey, birds' eggs, nectar, flowers, and other plant parts (2) (5) (8). Movement through the trees is either by walking or running on all fours, or by leaping, with the long tail aiding balance (1) (5) (9) (11). Squirrel monkeys form the largest groups of any New World primates (2) (5), with group size ranging from 20 to 50 or more and including individuals of both sexes and all ages (1) (9) (11). Unusually, groups appear to engage in relatively little social activity such as mutual grooming (5) (7). It is likely that, as in other species, the female black squirrel monkey gives birth to a single young (7) (9), probably in the rainy season (7), after a gestation period of around 145 to 172 days (2) (8). The newborn clings to the female for the first few weeks of life, becoming independent after about a year (2). Female squirrel monkeys reach sexual maturity at around 2.5 to 3 years, and males at 4 to 5 years (2) (5) (7). Lifespan may be up to 30 years in captivity (2).