The social group of Preuss’s guenon consists of two to twelve individuals, usually comprising just one adult male, while the rest are females and their young (1); only rarely is there more than one male in a group. Preuss’s guenon is a polygynous species, meaning that each male mates with more than one female (7). It is the female that initiates mating, seeking the attention of a male and letting the male know she is ready to mate. A female gives birth to only a single young at a time (7).
Living in social groups dictates a need for communication, which Preuss’s guenon does using both visual and vocal signals, such as the low-frequency, territorial ‘boom call’ of the male (7). The visual displays are typically threatening, and include staring and opening the mouth with the teeth covered, head-bobbing accompanied by staring, and yawning whilst showing the teeth (7).
The diet of this primate consists primarily of fruit, mature tree leaves and, preferentially, leaf shoots (8), but it is also known to eat seeds and flowers (1).