The ground dwelling guenons tend to have more males than females, with one dominant male, but all mating with the females. In some, the male is peripheral to the female core, moving among all-female groups. Males are generally a little bigger and a lot heavier than females. Guenons are territorial but not fiercely so and avoid serious fighting. When two groups meet, they engage in loud barking displays.
Guenons are expressive vocally.
They also use the bright markings on their faces and bodies to highlight their moods and intentions. Different species of guenons may travel together, or travel with other primates like mangabeys or colobus. Some different species may even join forces to oust another intruding primate species. But guenons don't associate with baboons or chimpanzees, who also frequent their home range, perhaps because these primates often prey on smaller monkeys. With their cheek pouches, they often bring food away from the parent tree before eating it, thus adding mileage to seed dispersal.