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BiologyZanzibar red colobus are found in large gregarious troops of 5-50 individuals. Family groups tend to consist of a single male, a small number of females and their young, and these break away from the main troop in order to forage. Groups spend the majority of their time in the treetops, foraging for leaves and fruit, although near to human settlements a few individuals have developed a taste for charcoal (5). Births take place throughout the year and a single offspring is born after a gestation period of around 5 months. The infant is carried on its mother's belly through the trees for up to three months (5).