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BiologyLittle is known about the specific behaviour of Pennant's red colobus, but much can be inferred from what is known about red colobus species generally (5). Red colobus typically live in large troops of 12 to 82 individuals (7), a single troop residing in a territory of 25 to 150 hectares (5). Sovereignty over the territory is signalled via a variety of barks and chirps given by all members (5). Like other red colobus, Pennant's red colobus' groups are multi-male and multi female, usually with around twice as many females (6). Females tend to remain with the same group throughout their lives, while males may move from group to group (5). Little is known about the reproductive biology of Pennant's red colobus. Red colobus are arboreal, often leaping across wide gaps by using the elasticity of a branch to propel themselves between trees (5). The diet consists of leaves, fruit, seeds and flowers (3) (5). Colobines are the only monkeys with chambered stomachs specially adapted to help digest tough leaf material (7).