The grey snub-nosed monkey eats a variety of plant material, including leaves, leaf buds, flower buds, fruits, seeds and bark, and it also feeds on insect larvae (1) (3) (6) (7). The types of food taken vary depending on the season (6) (7) (8) (9), although insects are eaten year-round (7). The buds of Magnolia sprengeri appear to be particularly important in the grey snub-nosed monkey’s diet, especially in winter (7).
The grey snub-nosed monkey is diurnal, which means that it is active during the daytime and sleeps at night (1). Although mostly arboreal, the grey snub-nosed monkey does come to the ground when its habitat lacks the appropriate tree cover (1).
The birth season for the grey snub-nosed monkey is from April to May (1), and the gestation period is approximately 200 days (10). Usually only one young is born at a time, or occasionally two. Male grey snub-nosed monkeys are likely to reach sexual maturity at about seven years old and females at four to five years (10).
The social system of the grey snub-nosed monkey is based on small groups of several females and their young with a single dominant male. These groups often come together into large cohesive bands to travel and rest, and these bands can consist of up to 400 individuals or more (1) (6) (8). All-male groups of around two to five adult or subadult males also occur (6).