| Spider monkey[1] | |
|---|---|
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| Black-headed spider monkey (Ateles fusciceps) | |
Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Primates |
| Family: | Atelidae |
| Subfamily: | Atelinae |
| Genus: | Ateles É. Geoffroy, 1806 |
| Type species | |
| Simia paniscus | |
| Species | |
See text | |
_range.png) | |
| Range of the spider monkeys | |
Spider monkeys areNew World monkeys belonging to thegenusAteles, part of the subfamilyAtelinae, familyAtelidae. Like other atelines, they are found intropical forests of Central and South America, from southernMexico toBrazil. The genus consists of seven species, all of which are under threat; thebrown spider monkey is critically endangered. They are also notable for their ability to be easilybred in captivity.
Disproportionately long limbs and longprehensile tails make them one of the largest New World monkeys and give rise to their common name. Spider monkeys live in the upper layers of therainforest andforage in the high canopy, from 25 to 30 m (82 to 98 ft).[2] They primarily eat fruits, but will also occasionally consume leaves, flowers, and insects.[2] Due to their large size, spider monkeys require large tracts of moist evergreen forests, and prefer undisturbed primary rainforest.[2] They are social animals and live in bands of up to 35 individuals, but will split up to forage during the day.[3]
Recentmeta-analyses onprimate cognition studies indicated spider monkeys are the most intelligent New World monkeys.[4] 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.[3]
They are an important food source due to their large size, so are widely hunted by local human populations; they are also threatened byhabitat destruction due to logging and land clearing.[3] Spider monkeys are susceptible to malaria and are used in laboratory studies of the disease.[3] The population trend for spider monkeys is decreasing; theIUCN Red List lists one species asvulnerable, five species asendangered and one species ascritically endangered.
Theories abound about the evolution of theatelines; one theory is they are most closely related to thewoolly spider monkeys (Brachyteles), and most likely split from woolly monkeys (Lagothrix) in the South American lowland forest, to evolve their unique locomotory system.[5] This theory is not supported by fossil evidence. Other theories includeBrachyteles,Lagothrix andAteles in an unresolvedtrichotomy,[6] and two clades, one composed ofAteles andLagothrix and the other ofAlouatta andBrachyteles.[7] More recent molecular evidence suggests the Atelinae split in the middle to lateMiocene (13Ma), separating spider monkeys from the woolly spider monkeys and the woolly monkeys.[8]
The genus nameAteles derives from theancient greek wordἀτέλεια (atéleia), meaning "incomplete, imperfect",[9][10] in reference to the reduced or non-existent thumbs of spider monkeys.
The genus contains seven species, and seven subspecies.[1]
Spider monkeys are among the largest New World monkeys;black-headed spider monkeys, the largest spider monkey, have an average weight of 11 kilograms (24 lb) for males and 9.66 kg (21.3 lb) for females.[11][12] Disproportionately long, spindly limbs inspired the spider monkey'scommon name. Their deftlyprehensile tails,[13] which may be up to 89 cm (35 in) long, have very flexible, hairless tips and skin grooves similar tofingerprints. This adaptation to their strictlyarboreal lifestyle serves as a fifth hand.[14] 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.[15] The fingers are elongated and recurved.[16]
Their hair is coarse, ranging in color from ruddy gold to brown and black, or white in a rare number of specimens.[17][18] The hands and feet are usually black. Heads are small with hairless faces. Thenostrils are very far apart, which is a distinguishing feature of spider monkeys.[19]
Spider monkeys are highly agile, and they are said to be second only to thegibbons in this respect. They have been seen in the wild jumping from tree to tree.[20]
Female spider monkeys have aclitoris that is especially developed; it may be referred to as apseudo-penis because it has an interior passage, or urethra, that makes it almost identical to thepenis, 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.[21] 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 identifyingscent-marking glands that may be present on the clitoris.[22]
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Spider monkeys form loose groups, typically with 15 to 25 individuals,[23] but sometimes up to 30 or 40.[24][25] 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[26] but can sometimes be up to 17 animals.[25] Also less common in primates, females rather than males disperse atpuberty to join new groups. Males tend to stick together for their whole lives. Hence, males in a group are more likely to be related and have closer bonds than females. Males also cement bonds through "grappling": prolonged hugging, face greeting, tail intertwining, and genital manipulation.[27] However, the strongest social bonds are between females and their young offspring.[28]
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 4 kilograms (8.8 lb) and drop them towards the intruder. The monkeys also defecate and urinate toward the intruder.[29]
Spider monkeys arediurnal and spend the night sleeping in carefully selected trees. Groups are thought to be directed by a lead female, which is responsible for planning an efficient feeding route each day.Grooming is not as important to social interaction, owing perhaps to a lack of thumbs.[30]
Spider monkeys have been observed avoiding the upper canopy of the trees for locomotion.[31] One researcher speculated this was because the thin branches at the tops of trees do not support the monkeys as well.[32]
At 107 grams (3.8 oz), the spider monkeybrain is twice the size of the brain of ahowler monkey of equivalent body size;[33] this is thought to be a result of the spider monkeys' complex social system and theirfrugivorous 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[34] to 27 years or more, and females give birth once every 17 to 45 months.[35] Gummy, presumably the oldest spider monkey in captivity, is presumed to have been born wild in 1962, resided at Fort Rickey Children's Discovery Zoo located in Rome, New York,[36] and died at the age of 61, after living about twice as long as the average spider monkey.[37]
Spider monkeys eat fleshy fruits 71 to 83 percent of the time.[31] They can live for long periods on only one or two kinds of fruits and nuts. They eat the fruits of many big forest trees, and because they swallow fruits whole, theseeds are eventually excreted andfertilized by thefeces. Studies show the diet of spider monkeys changes their reproductive, social, and physical behavioral patterns. Most feeding happens from dawn to 10 am. Afterward, the adults rest while the young play. Through the rest of the day, they may feed infrequently until around 10 pm. If food is scarce, they may eatinsects, leaves, bird eggs,bark andhoney.[38]
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.[citation needed] The traveling groups have four to nine animals. Each group is closely associated with its territory.[39] 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. Thegestation period ranges from 226 to 232 days. Each female bears only one offspring on average, every three to four years.[30]
Until six to ten months of age, infants rely completely on their mothers.[29] 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.[34] Mothers are very protective of their young and are generally attentive mothers. They have been seen grabbing their young and putting them on their backs for protection and to help them navigate from tree to tree. They help the more independent young to cross by pulling branches closer together. Mothers also groom their young.
Male spider monkeys are one of the few primates that do not have a penis bone (baculum).[40][41]
Spider monkeys are found in many aspects of theMesoamerican cultures. In the Aztec 260-day calendar, Spider Monkey (NahuaOzomatli) serves as the name for the 11th day. In the corresponding Maya calendar,Howler Monkey (Batz) is substituted for Spider Monkey.[42] In present-day Maya religious feasts, spider monkey impersonators serve as a kind of demonic clowns.[43] 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.
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