Females tend to be a bit larger and heavier than males and they have an enlarged clitoris which resembles a penis. Spider monkeys are generally found in lowland rain forests from Mexico to South America, along the coasts and the banks of the Amazon, and the mountain forest slopes of the Andes. They are restricted to arboreal habitats, mainly in the top of the tree canopy. The range size varies. Their mean day range is generally longer than other NW monkeys, because of their reliance on fruit.
Groups defend their ranges.
Males will mark their territory with secretions from chest glands. Anyone stumbling into spider monkey territory receives an unpleasant welcome of screams, barks, and rattling branches and thrown branches or feces. The interactions will often begin with males, often along with one or two females, calling, which will bring other group members into the area. The outcome of conflict is site dependent. One group will displace another in the more central regions of their range.