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Species of New World monkey

The Peruvian spider monkey (Ateles chamek), also known as the black faced black spider monkey, is a species of spider monkey that lives in Peru, as well as in Brazil and in Bolivia. At long, they are relatively large among species of monkey, and their strong, prehensile tails can be up to long. Unlike many species of monkey, they have only a vestigial thumb, an adaptation which enables them to travel using brachiation. Peruvian spider monkeys live in groups of 20–30 individuals, but these groups are rarely all together simultaneously. The size and dynamics of the resulting subgroups vary with food availability and sociobehavioral activity. Individuals of this species also eat small animals, insects and leaves based on availability. Females separate from the band to give birth, typically in the fall. These females inhabit a group of core areas where resources are abundant in certain seasons. Its body can be long and the tail can be long. It has four elongated fingers and virtually no thumb, which is typical for spider monkeys but unusual for other monkeys. It can move easily through the trees and it has a prehensile tail like other species in the genus Ateles, which it uses to assist with brachiation. It has an agility that can only be compared to the gibbon of Asia. It has a life span of up to 20 years.

The species occurs in central northern of Bolivia, north eastern Peru, and the central western Brazilian Amazon. The species was recently found to occur in the northern bank of Solimões River, at the Mamirauá Reserve, where it probably colonized through a river meander cutoff process. They were also observed living in Amazonian seasonally flooded forests. probably because females separate themselves from the band for a few months to give birth, primarily in the fall. It has to contest with other spider monkeys, woolly monkeys, and howler monkeys for food and territory.

The spider monkey has a reproductive period that can span throughout the year, though most offspring are born at the start of the Autumn season. It has a gestation period of about 140 days. The pregnant female leaves the group to have her baby and returns 2–4 months later. The newborn spider monkey is independent at about 10 months. Studies show that in heavily hunted and farmed areas, large bodied primate species such as spider monkeys are likely to be some of the first species to be extirpated. Reintroduction efforts by researchers at Reserva Ecologica Taricaya have begun along the lower Madre de Dios river where conservation efforts now provide a suitable release site and protected habitat. There are several related species such as the Central American spider monkey or Geoffroy's spider monkey (A. geoffroyi), and the brown spider monkey (A. hybridus) and the species' closest relative the white bellied spider monkey (A. belzebuth). All of these have a prehensile tail, a thumbless hand, and other characteristics that are found in all spider monkeys.