Spider Monkeys: Behavior, Ecology and Evolution of the Genus AtelesSpider monkeys are one of the most widespread New World primate genera, ranging from southern Mexico to Bolivia. Although they are common in zoos, spider monkeys are traditionally very difficult to study in the wild, because they are fast moving, live high in the canopy and are almost always found in small subgroups that vary in size and composition throughout the day. The past decade has seen an expansion in research being carried out on this genus