Male and female monk sakis have different coat colors. In a study of seasonally flooded forest in northern Peru, seeds were their most frequent food, and they also ate arthropods.
At the northern Peruvian study site, adult males and females differed in coat color, and groups tended to avoid people. Their inconspicuous coats also made field observation difficult.
During 20 months in seasonally flooded forest, seeds made up 49% of 459 recorded feeding events, fruit pulp 25%, and arthropods 22%. These are feeding-event shares at that study site.
An extinction-risk assessment has not been added yet.