Little is known about the specific behaviour of Pennant’s red colobus, but much can be inferred from what is known about red colobus species in general (5). Red colobus typically live in large troops of 12 to 82 individuals (6), a single troop residing in a territory of 25 to 150 hectares (5). Ownership of the territory is signalled via a variety of barks and chirps given by all group members (5). As in other red colobus species, Pennant’s red colobus groups are multi-male and multi-female, usually with around twice as many females as males (6). Female red colobus tend to remain with the same group throughout their lives, while males may move from group to group (5).
Although little specific information is available on the reproductive biology of Pennant’s red colobus, like other red colobus species it is likely to give birth to a single infant after a gestation period of around 4.5 to 5.5 months (6).
Red colobus are arboreal, often leaping across wide gaps by using the elasticity of a branch to propel themselves between trees (5). The diet of these species consists of leaves, fruit, seeds and flowers (2) (5). Colobines have chambered stomachs specially adapted to help digest tough leaf material (8).