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Genus of mammals belonging to the New World monkeys

Automatic taxobox
|name = Spider monkey They primarily eat fruits, but will also occasionally consume leaves, flowers, and insects. Recent meta analyses on primate cognition studies indicated spider monkeys are the most intelligent New World monkeys. They can produce a wide range of sounds and will "bark" when threatened; other vocalisations include a whinny similar to a horse and prolonged screams. This theory is not supported by fossil evidence. Other theories include Brachyteles, Lagothrix and Ateles in an unresolved trichotomy, and two clades, one composed of Ateles and Lagothrix and the other of Alouatta and Brachyteles. More recent molecular evidence suggests the Atelinae split in the middle to late Miocene (13 Ma), separating spider monkeys from the woolly spider monkeys and the woolly monkeys.

Spider monkeys are among the largest New World monkeys; black headed spider monkeys, the largest spider monkey, have an average weight of for males and for females. Disproportionately long, spindly limbs inspired the spider monkey's common name. Their deftly prehensile tails, which may be up to long, have very flexible, hairless tips and skin grooves similar to fingerprints. This adaptation to their strictly arboreal lifestyle serves as a fifth hand. When the monkey walks, its arms practically drag on the ground. Unlike many monkeys, they do not use their arms for balance when walking, instead relying on their tails. The hands are long, narrow, and hook like and have reduced or nonexistent thumbs. The fingers are elongated and recurved. Their hair is coarse, ranging in color from ruddy gold to brown and black, or white in a rare number of specimens. The hands and feet are usually black. Heads are small with hairless faces. The nostrils are very far apart, which is a distinguishing feature of spider monkeys. Spider monkeys are highly agile, and they are said to be second only to the gibbons in this respect. They have been seen in the wild jumping from tree to tree. Female spider monkeys have a clitoris that is especially developed; it may be referred to as a pseudo penis because it has an interior passage, or urethra, that makes it almost identical to the penis, and retains and distributes urine droplets as the female moves around. This urine is emptied at the bases of the clitoris, and collects in skin folds on either side of a groove on the perineal. Researchers and observers of spider monkeys of South America look for a scrotum to determine the animal sex because these female spider monkeys have pendulous and erectile clitorises long enough to be mistaken for a penis; researchers may also determine the animal's sex by identifying scent marking glands that may be present on the clitoris.

Spider monkeys form loose groups, typically with 15 to 25 individuals, but sometimes up to 30 or 40. During the day, groups break up into subgroups. The size of subgroups and the degree to which they avoid each other during the day depends on food competition and the risk of predation. The average subgroup size is between 2 and 8 but can sometimes be up to 17 animals. Spider monkeys communicate their intentions and observations using postures and stances, such as postures of sexual receptivity and of attack. When a spider monkey sees a human approaching, it barks loudly similar to a dog. When a monkey is approached, it climbs to the end of the branch it is on and shakes it vigorously to scare away the possible threat. It shakes the branches with its feet, hands, or a combination while hanging from its tail. It may also scratch its limbs or body with various parts of its hands and feet. Seated monkeys may sway and make noise. Males and occasionally adult females growl menacingly at the approach of a human. If the pursuer continues to advance, the monkeys may break off live or dead tree limbs weighing up to and drop them towards the intruder. The monkeys also defecate and urinate toward the intruder. Spider monkeys have been observed avoiding the upper canopy of the trees for locomotion. One researcher speculated this was because the thin branches at the tops of trees do not support the monkeys as well. At , the spider monkey brain is twice the size of the brain of a howler monkey of equivalent body size; this is thought to be a result of the spider monkeys' complex social system and their frugivorous diets, which consist primarily of ripe fruit from a wide variety (over 150 species) of plants. This requires the monkeys to remember when and where fruit can be found. The slow development may also play a role: the monkeys may live from 20 to 27 years or more, and females give birth once every 17 to 45 months. Gummy, presumably the oldest spider monkey in captivity, is presumed to have been born wild in 1962 and currently resided at Fort Rickey Childrens Discovery Zoo located in Rome, New York, and died at the age of 61 (about twice as long as the average spider monkey).

Spider monkeys eat fleshy fruits 71 to 83 percent of the time. Spider monkeys have a unique way of getting food: a lead female is generally responsible for finding food sources. If she cannot find enough food for the group, it splits into smaller groups that forage separately. The traveling groups have four to nine animals. Each group is closely associated with its territory. If the group is big, it spreads out.

The female chooses a male from her group for mating. Both males and females use "anogenital sniffing" to check their mates for readiness for copulation. The gestation period ranges from 226 to 232 days. Each female bears only one offspring on average, every three to four years. Males are not involved in raising the offspring. A mother carries her infant around her belly for the first month after birth. After this, she carries it on her lower back. The infant wraps its tail around its mother's and tightly grabs her midsection.

Spider monkeys are found in many aspects of the Mesoamerican cultures. In the Aztec 260 day calendar, Spider Monkey (Nahua Ozomatli) serves as the name for the 11th day. In the corresponding Maya calendar, Howler Monkey (Batz) is substituted for Spider Monkey. In present day Maya religious feasts, spider monkey impersonators serve as a kind of demonic clowns. In Classical Maya art, they are ubiquitous, often shown carrying cacao pods. Captain Simian & the Space Monkeys features a spider monkey named Spydor who is the smallest of the crew.