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BiologyBrown lemurs live in multimale-multifemale groups without a noticeable hierarchy, generally numbering from 3 to 12 individuals, with 9 to 12 being the norm (2) (5). Breeding is seasonal with mating usually occurring in May and June. The gestation period is approximately 120 days, with infants born between September and October, at the onset of the rainy season. A single offspring is usual, although twins have been reported (2). Brown lemurs reach sexual maturity between one and three years, and the lifespan in the wild is believed to range between 20 and 25 years (2) (5). This species is cathemeral, meaning it is active at varying times throughout the day and night. Fruit, mature leaves, flowers, bark, sap, soil, insects, centipedes and millipedes form the bulk of this lemur's diet (6).