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White-headed Capuchin

 
Wikipedia: White-headed Capuchin
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White-headed Capuchin[1]
Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Primates
Family: Cebidae
Genus: Cebus
Species: C. capucinus
Binomial name
Cebus capucinus
(Linnaeus, 1758)
Distribution of Cebus capucinus[3]
Synonyms
  • C. albulus (Pusch, 1942)
  • C. curtus (Bangs, 1905)
  • C. hypoleucus (É. Geoffroy, 1812)
  • C. imitator (Thomas, 1903)
  • C. limitaneus (Hollister, 1914)
  • C. nigripectus (Elliot, 1909)

The White-headed Capuchin (Cebus capucinus), also known as the White-faced Capuchin or White-throated Capuchin, is a medium-sized New World monkey of the family Cebidae, subfamily Cebinae. Native to the forests of Central America and the extreme north-western portion of South America, the White-headed Capuchin is important to rainforest ecology for its role in dispersing seeds and pollen.

Among the best known monkeys, the White-headed Capuchin is recognized as the typical companion to the organ grinder. In recent years the species has become popular in North American media. It is a highly intelligent monkey and has been trained to assist paraplegic persons. It is a medium-sized monkey, weighing up to 3.9 kg (8.6 lb). It is mostly black, but with a pink face and white on much of the front part of the body, giving it its common name. It has a distinctive prehensile tail that is often carried coiled up and is used to help support the monkey when it is feeding beneath a branch.

In the wild, the White-headed Capuchin is versatile, living in many different types of forest, and eating many different types of food, including fruit, other plant material, invertebrates, and small vertebrates. It lives in troops that can exceed 20 animals and include both males and females. It is noted for its tool use, including rubbing plants over its fur in an apparent use of herbal medicine, and also using tools as weapons and for getting to food. It is a long-lived monkey, with a maximum recorded age of over 54 years.

Contents

Description

Like other monkeys in the genus Cebus, the White-headed Capuchin is named after the order of Capuchin friars – the cowls worn by these friars closely resemble the monkey's head coloration.[4][5] The White-headed Capuchin has mostly black fur, with white to yellowish fur on the neck, throat, chest, shoulders, and upper arms.[6] The face is pink.[6] A V-shaped area of black fur on the crown of the head is distinctive.[6][7] It has a prehensile tail that is often held coiled, giving the White-headed Capuchin the nickname "ringtail".[6][8]

Adults reach a length of between 335 and 453 mm (13.2 and 17.8 in), excluding tail, and a weight of up to 3.9 kg (8.6 lb).[6][7] The tail is longer than the body, at up to 551 mm (21.7 in) in length.[6][7] Males are about 27% larger than females.[9] The brain of a White-headed Capuchin is about 79.2 g (2.79 oz), which is larger than that of several larger monkey species, such as the Mantled Howler.[7][10]

Distribution and habitat

The White-headed Capuchin is found in much of Central America and a small portion of South America. In Central America, its range includes much of Honduras, Nicaragua, Costa Rica and Panama.[3] It has also been reported to occur in eastern Guatemala and southern Belize, but these reports are unconfirmed.[3] In South America the White-headed Capuchin is found in the extreme north-western strip between the Pacific Ocean and the Andes Mountains in Colombia and northwestern Ecuador.[3] It is among the most commonly seen monkeys in Central America's national parks, such as Manuel Antonio National Park, Corcovado National Park, Santa Rosa National Park and Soberania National Park.[11]

It is found in many different types of forest, including mature and secondary forests, and including evergreen and deciduous forests, dry and moist forests, and mangrove and montane forests.[6][12] However, it appears to prefer primary or advanced secondary forests.[13] Also, higher densities of White-headed Capuchins are found in older areas of forest and in areas containing evergreen forest, as well as areas with more water availability during the dry season.[14]

In Manuel Antonio National Park, Costa Rica

Behavior

Social structure

The White-headed Capuchin is a diurnal and arboreal animal.[6] However, it does come down to the ground more often than many other New World monkeys.[15] It moves primarily by walking on all four limbs.[16] It forms troops, or groups, that typically consist of 10 to 30 monkeys, although larger troops have been observed.[17][18] The average troop size is 16 monkeys.[9][19] Troops contain more females than males and on average there are 0.71 males for every female.[9][13] Ocassionally, a group will split into two when a small subgroup of males and females, with the females' dependent offspring, leave the group to either establish their own distinct group or join a neighboring group.[20]

The troop is led by a dominant male and female.[5] Dominance hierarchies exist, and more subordinate animals are likely to be chased more often and be subject to higher levels of physical aggression than dominant animals.[21] However, the level of agonism in wild White-headed Capuchins is very low, and subordinate animals engage in some forms of agonism, such as supplanting another monkey from a preferred location, about as often as dominant animals.[21] The females are generally related, since females typically remain in their natal troop for life.[9] Although the males are not necessarily related to each other, they are less competitive than male South American capuchins, and they associate with each other and cooperate to drive away predators and males from outside the troop.[5][22] This may be because, unlike in South American capuchins, the dominant male in the troop does not necessarily monopolize breeding.[5] These alliances are critical both for troop males to be able to repel potential invading males and for emigrating males to be able to take over a new troop.[22] Thus, troop males tend to emigrate to new troops together.[9] Male emigration to a new troop typically occurs about every 4 years.[22][23] Males engage in a variety of affiliative behaviors that help maintain alliances. These behaviors include sniffing hands and sucking body parts.[13] Males will even mount each other and engage in male-male sex, especially during tense situations.[24][25]

Walking on four limbs

White-headed Capuchin troops occupy home ranges of between 32 and 86 hectares (79 and 210 acres).[7] They travel between 1 and 3 kilometres (0.62 and 1.9 mi) daily, averaging 2 kilometres (1.2 mi) per day.[13] Although they engage in activity that has been described as "territorial", more recent research indicates that White-headed Capuchin troops tend to behave aggressively to other White-headed Capuchin troops regardless of where they meet, and the aggression is not necessarily intended to exclude the other troops from a specific home range.[26]

Grooming pervades social interaction. Lower ranking animals are more likely to groom higher ranking animals than vice versa.[21] Females do more grooming than males, and groom other females more than they groom males.[21] Females associate closely among themselves.[21] When non-troop males attempt to supplant the existing troop males, the females usually keep themselves and their infants away from any resulting fighting.[21] However, females sometimes form coalitions to help troop males attempt to repel the intruders, since females can be wounded and infants killed in the aftermath of successful takeovers.[21]

The White-headed Capuchin sometimes interacts with other sympatric monkey species. White-headed Capuchins sometimes travel with and even groom Geoffroy's Spider Monkeys.[7][13] However, aggressive interactions between the capuchins and spider monkeys also occur.[27] Interactions between the White-headed Capuchin and Mantled Howler are infrequent, and sometimes result in the capuchins threatening the larger howlers.[13] However, affiliative associations between the capuchins and howlers do sometimes occur, mostly involving juveniles playing together.[27]

Although South American capuchin species often travel with and feed together with squirrel monkeys, the White-headed Capuchin only rarely associates with the Central American Squirrel Monkey. This appears to be related to the patchier, more dispersed distribution of food resources in Central America and the fact that there is less dietary overlap between the Central American Squirrel Monkey and the White-headed Capuchin than between their South American counterparts. Therefore, there is less benefit to the Central American Squirrel Monkey in associating with the White-headed Capuchin in order to exploit the capuchin's knowledge of food resource distribution. In addition, compared to their South American counterparts, male White-headed Capuchins are relatively more alert to rival males than to predators, reducing the predator detection benefits that the Central American Squirrel Monkey receives from associating with the White-headed Capuchin compared to its South American counterparts. Since the squirrel monkeys generally initiate interactions with the capuchins in South America, the fact that similar associations would impose higher foraging costs and impart fewer predator detection benefits to the Central American Squirrel Monkey leads to fewer associations with the White-headed Capuchin.[9][28][29][30]

Several non-primate animal species tend to follow troops of White-faced Monkeys or are otherwise attracted by their presence. White-lipped Peccaries and Common Agoutis are attracted by feeding White-headed Capuchins, looking for fruit that the capuchins drop.[13] Several species of bird are also known to follow White-headed Capuchins looking for food. These include the Double-toothed Kite, the White Hawk and the Sharp-shinned Hawk.[13]

Diet

Foraging in the trees

The White-headed Capuchin is an omnivore. Its primary foods are fruit and insects.[5] It forages at all levels of the forest, and also forages on the ground.[13] Methods for finding food include stripping bark off of trees, searching through leaf litter, breaking dead tree branches, rolling over rocks, and using stones as anvils to crack hard fruits.[31] Its prehensile tail assists with feeding, helping support the monkey when foraging for food below the branches.[13]

Fruit can make up between 50% and 67% or more of the capuchin's diet.[5] In one study in Panama, White-headed Capuchins ate 95 different fruit species.[5] Among its favorite fruits are figs from the family Moraceae, mangos and related fruits from the family Anacardiaceae, the bean-like fruits from the family Leguminosae and fruits from the family Rubiaceae.[32] It generally only eats ripe fruit, testing for ripeness by smelling, tasting and prodding the fruit.[5] It typically eats only the pulp and juice, spitting out the seeds and fibers.[5] Other plant matter eaten includes flowers, young leaves, seeds of certain plants, and bromeliads.[5][33] It also uses the bromelids as a water source, drinking the water that gets trapped inside.[5]

Insect prey eaten includes beetle larvae, butterfly and moth caterpillars, ants, wasps, and ant and wasp larvae.[5] It also eats larger prey, such as birds, bird eggs, frogs, lizards, crabs, mollusks and small mammals.[5][34] The population in Guanacaste, Costa Rica in particular is noted for hunting squirrels, magpies, White-crowned Parrots[5] and baby coatis.[35] The amount of vertebrate prey eaten varies by troop.[5] Even neighboring troops can show significant differences in their diets.[31]

The diet can vary between the rainy and dry season. For example, in Guanacaste, Costa Rica the White-headed Capuchin can eat a wide variety of fruits as well as caterpillars in the early rainy season (June to November).[32] But during the dry season, only figs and a few other types of fruit are available.[32] During the dry season, chitinous insects, ant and wasp larvae and vertebrates become a particularly important part of the White-headed Capuchin's diet.[32] Access to water can also become an issue during the dry season. The White-headed Capuchin likes to drink daily, so in forests where water holes dry up during the dry season, there can be competition between troops over access to the remaining water holes.[32]

Tool use

Capuchins are considered among the most intelligent of the New World monkeys; they have been the subject of many studies on behaviour and intelligence. The capuchins' intelligence is thought to be an adaptation to support their feeding habits; they rely on ephemeral food sources which may be hard to find. In one particular study conducted in 2007, capuchins were found to be among the ten most intelligent primates, second to spider monkeys among New World monkeys.[36]

The White-headed Capuchin is known to rub parts of certain plants into their fur. Plants used in this manner include citrus fruits, vines of the genera Piper and Clematis, monkey comb (genus Sloanea), dumb cane and custard apple.[5][34] Ants and millipedes are also used in this way.[5] It is not definitively known what this fur rubbing is for, but this may deter parasites such as ticks and insects, or it may serve as a fungicide or bactericide or anti-inflammatory agent.[5] Alternatively, it may be a form of scent marking.[5]

The White-headed Capuchin also uses tools in other ways. It has been known to beat snakes with sticks in order to protect itself or to get the snake to release an infant.[5] In captivity, it has been known to use tools to get to food or to defend itself, and in one case a White-headed Capuchin used a squirrel monkey as a projectile, hurling it at a human observer.[5] Some populations also use trees or other hard surfaces as anvils in order to crack mollusks.[34] And it sometimes uses sticks as probes to explore openings.[37]

The White-headed Capuchin's intelligence and ability to use tools allows them to be trained to assist paraplegics.[38] Other species of capuchin monkeys are also trained in this manner.[39] White-headed Capuchins can also be trained for roles on television and movies, such as Marcel on the television series Friends.[40] They were also traditionally used as organ grinder monkeys.[12]

Communication

Facial expression

The White-headed Capuchin is noisy.[6] Loud calls, such as barks and coughs, are used to communicate threat warnings, and softer calls, such as squeals, are used in intimate discourse.[5] Different types of threats, such as a threat from a terrestrial animal versus a threat from a bird, invoke different vocalizations.[13] Facial expressions and scent are also important to communication.[21] It sometimes engages in a practice known as "urine washing", in which the monkey rubs urine on its feet.[41] The exact purpose of this practice is unknown, but it may be a form of olfactory signal.[21]

Reproduction

The White-headed Capuchin uses a polygamous mating system in which a male may mate with multiple females.[13] Although the dominant male does not monopolize breeding, studies have shown that the dominant male does tend to father most of the young.[23] Although a female may mate with several males, the dominant male may be more likely to copulate when the female is at peak fertility.[23][42] Nonetheless, there is evidence that dominant males do tend to avoid breeding with their own daughters who are members of the troop.[43] Such avoidance is rare among New World primates.[43]

Copulation takes about 2 minutes, and the gestation period is 5 to 6 months.[13] Usually a single young is born, but twins occur occasionally. Most births occur during the dry season from December to April.[7][13] The infant is carried across its mother's back for about 6 weeks.[13] After about 4 to 5 weeks it can stray from its mother for brief periods and by about 3 months it can move around independently, although some infants will be mostly independent earlier. Weaning occurs between 6 and 12 months. While the mother rests, the young spends most of its time foraging or playing, either on its own or with other juveniles.[13] Capuchins engage in high levels of alloparenting, in which monkeys other than the mother help care for the infant.[44] Infants are carried by alloparents most often between 4 and 6 weeks in age.[45] Males as well as females engage in alloparenting.[13][45]

Like other capuchin species, the White-headed Capuchin matures slowly. Sexual maturity can be reached at 3 years.[12] But on average, females give birth for the first time at 7 years old and give birth every 26 months thereafter.[9] Males attain reproductive maturity at 10 years old.[9] The White-headed Capuchin has a long life span given its size. The maximum recorded life span in captivity is over 54 years.[9]

Conservation status

The White-headed Capuchin is regarded as "least concern" from a conservation standpoint by IUCN. However, its numbers are impacted by the fact that it is sometimes captured for the pet trade.[5] Its status can also be harmed by deforestation. However, deforestation may also impact its main predator, the Harpy Eagle, more than it directly impacts the White-headed Capuchin, and so on a net basis deforestation may not be as harmful to the capuchin's status.[5] The White-headed Capuchin can adapt to forest fragmentation better than other species due to its ability to live in a wide variety of forest types and exploit a wide variety of food sources.[46] The White-headed Capuchin is important to its ecosystems as a seed and pollen disperser.[5][12] It also impacts the ecosystem by eating insects that act as pests to certain trees, by pruning certain trees, such as Gustavia superba and Bursera simaruba, causing them generate more branches and possibly additional fruit, and by accelerating germination of certain seeds when they pass through the capuchin's digestive tract.[5] In addition, the White-headed Capuchin sometimes kills Acacia collinsii plants when it rips through the plant's branches to get to resident ant colonies.[5]

Taxonomy

Some authorities consider this a member of the subspecies Cebus capucinus imitator.

The White-headed Capuchin was one of the many species originally described by Linnaeus in his 18th century work, Systema Naturae.[47] It is a member of the family Cebidae, the family of New World monkeys containing capuchin monkeys, squirrel monkeys, tamarins and marmosets. It is the type species for the genus Cebus, the genus that includes all the capuchin monkeys.[48] It is a member of the C. capucinus species group within the genus Cebus, a group that also includes the White-fronted Capuchin, the Weeper Capuchin and the Kaapori Capuchin.[48]

There is disagreement among primatologists about whether there are any subspecies of White-headed Capuchin. Some authorities consider there to be three subspecies of White-headed Capuchin, based on small differences in appearance:[3]

However, other authorities do not recognize any separate subspecies, and regard C. c. imitator and C. c. limitaneus as synonyms of C. capucinus.[1]

References

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  47. ^ (Latin) Linnaeus, C (1758). Systema naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Tomus I. Editio decima, reformata. Holmiae. (Laurentii Salvii). 
  48. ^ a b Groves, C. (2005). Wilson, D. E., & Reeder, D. M.. ed. Mammal Species of the World (3rd ed.). Johns Hopkins University Press. ISBN 0-801-88221-4. http://www.bucknell.edu/msw3/browse.asp?id=12100255. 

External links

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Costa Rican monkey species

Central American Squirrel Monkey (Saimiri oerstedii) · Geoffroy's Spider Monkey (Ateles geoffroyi) · Mantled Howler (Alouatta palliata) · White-headed Capuchin (Cebus capucinus) ·
v • d • e
Panamanian monkey species

Black-headed Spider Monkey (Ateles fusciceps) · Central American Squirrel Monkey (Saimiri oerstedii) · Coiba Island Howler (Alouatta coibensis) · Geoffroy's Spider Monkey (Ateles geoffroyi) · Geoffroy's Tamarin (Saguinus geoffroyi) · Mantled Howler (Alouatta palliata) · Panamanian Night Monkey (Aotus zonalis) · White-headed Capuchin (Cebus capucinus) ·

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