The brown-headed spider monkey moves around in the daytime foraging for ripe fruit, which comprises 83 percent of its diet (9). Through this diet, this species playsan important ecological role within the forest as a seed-disperser (1). At the beginning of the dry season, when fruit is scarce, it consumes a greater amount of leaves, flowers, seeds, bark and honey, and will also occasionally eat small insects (2). The brown-headed spider monkey almost never comes down from the trees but spends its days climbing and swinging through the upper levels of the canopy (7).
Like all spider monkeys, the brown-headed spider monkey lives in a fission-fusion community consisting of many males and many females (8), in which large groups (of 20 to 100 individuals) divide into smaller, temporary subgroups for feeding (1). After a gestation period of seven to eight months a single offspring is born. The young first leaves its mother to play at ten weeks, but will continue to ride on its mother’s back when moving through the forest until 16 weeks of age (9). The brown-headed spider monkey becomes sexually mature at about four years and has a life span of around 24 years (11).