Weight of adults are between 6 to 18 kg. Feeds on fruits, berries, leaves, insects and small birds. Feeds immediately upon waking up, especially if there are nearby Ficus trees. It then spends the day in the same area, wandering hardly more than 500m during the entire day. May travel up to 3km a day if feeding trees are scattered.
Females have on average one infant every two years.
Communication among stump-tailed macaques involves auditory, visual, tactile and olfactory signals. When alarmed, it gives out a short, harsh bark. Generally they squeal and chatter when feeding. Threats Formerly exported in large numbers for biomedical research, especially from peninsular Thailand where there used to be a big population. Its export was banned in 1976, but some illegal trafficking still occurs, so threat from trapping still exists.