The basic social group of the western woolly lemur consists of a monogamous breeding pair and their offspring (2) (5). A single offspring is usually born between September and October after a gestation period of 120 to 150 days, and juveniles may remain with their natal group until up to two years of age (2) (5). Family units occupy overlapping home ranges of two hectares and territories are defended and demarcated via calls (2).
Almost exclusively nocturnal, the western woolly lemur becomes active around dusk. The family unit largely stays together while foraging. The bulk of the diet consists of young leaves and buds taken from at least 20 different plant species (2). This folivorous diet is, however, highly specialized, including tree species that are relatively rare (6).