The brown howler monkey consumes new leaves and fruit as the main part of the diet. Flowers and insects are also sometimes eaten. This is a diurnal species. The mean group size for this species is about 20 individuals. Both males and females disperse from natal groups in this species.
Multimale groups can also occur.
The brown howler monkey gives birth to a single offspring. Burton, F. 1995. The Multimedia Guide to the Non-human Primates . Canada Inc. Fleagle, J. G. 1988. Primate Adaptation and Evolution.