Wikipedia

Capuchin monkey

Thecapuchin monkeys(/ˈkæpjʊ(t)ʃɪn/) areNew World monkeysof the subfamilyCebinae.They are readily identified as the "organ grinder"monkey, and have been used in many movies and television shows. The range of capuchin monkeys includes some tropical forests inCentral AmericaandSouth Americaas far south as northernArgentina.In Central America, where they are called white-faced monkeys ( "carablanca" ), they usually occupy the wet lowland forests on theCaribbean coast of Costa Ricaand Panamaand deciduous dry forest on the Pacific coast.

Capuchin monkey
Temporal range:6.2–0MaLateMiocene-Present
Panamanian white-faced capuchin(Cebus imitator) on a tree near a river bank in the jungles ofGuanacaste,Costa Rica.
Scientific classificationEdit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Primates
Suborder: Haplorhini
Infraorder: Simiiformes
Family: Cebidae
Subfamily: Cebinae
Bonaparte,1831
Genera

Cebus
Sapajus

Etymology

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The word "capuchin" derives from theOrder of Friars Minor Capuchin,who wear brown robes with large hoods. WhenPortuguese explorersreached theAmericasin the 15th century, they found small monkeys whose coloring resembled these friars, especially when in their robes with hoods down, and named them capuchins.[1]When the scientists described a specimen (thought to be agolden-bellied capuchin) they noted that: "his muzzle of a tanned color,... with the lighter color around his eyes that melts into the white at the front, his cheeks..., give him the looks that involuntarily reminds us of the appearance that historically in our country represents ignorance, laziness, and sensuality."[2]The scientific name of the genus,Cebuscomes from the Greek wordkêbos,[3]meaning a long-tailed monkey.

Classification

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The species-leveltaxonomyof this subfamily remains highly controversial, and alternative treatments than the one listed below have been suggested.[4][5][6][7]

In 2011, Jessica Lynch Alfaro et al. proposed that therobust capuchins(formerly theC. apellagroup) be placed in a separate genus,Sapajus,from thegracile capuchins(formerly theC. capucinusgroup) which retain the genusCebus.[8][9]Other primatologists, such asPaul Garber,have begun using this classification.[10]

According to genetic studies led by Lynch Alfaro in 2011, the gracile and robust capuchins diverged approximately 6.2 million years ago. Lynch Alfaro suspects that the divergence was triggered by the creation of the Amazon River, which separated the monkeys in the Amazon north of the Amazon River, who then evolved into the gracile capuchins. Those in the Atlantic Forest south of the river evolved into the robust capuchins. Gracile capuchins have longer limbs relative to their body size than robust capuchins, and have rounder skulls, whereas robust capuchins have jaws better adapted for opening hard nuts. Robust capuchins have crests and the males have beards.[8][9]

Tufted capuchin(Sapajus apella)

* Rediscovered species.[13]

The oldest known crownplatyrrhineand member of Cebidae,Panamacebus transitus,is estimated to have lived 21 million years ago. It is the earliest known fossil evidence of a mammal travelling between South and North America.[14]

Physical characteristics

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Capuchins are black, brown,buffor whitish, but their exact color and pattern depends on the species involved. Capuchin monkeys are usually dark brown with a cream/off-white coloring around their necks. They reach a length of 30 to 56 cm (12 to 22 in), with tails that are just as long as the body. On average, they weigh from 1.4 to 4 kg (3 to 9 pounds) and live up to 25 years old in their natural habitats,[citation needed]and up to 35 in captivity.[citation needed]

Habitat and distribution

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Capuchins prefer environments that give them access to shelter and easy food, such as low-lying forests, mountain forests, and rain forests. They are particularly abundant in Argentina, Brazil, Costa Rica, Honduras, Paraguay, and Peru. They use these areas for shelter at night and food access during the day. The canopy of the trees allows for protection from threats above, and the capuchin monkeys' innate ability to climb trees with ease allows them to escape and hide from predators on the jungle floor. This environment is mutually beneficial for the capuchins and for the ecosystem in which they inhabit. This is because they spread their seed leftovers and fecal matter across theforest floorwhich helps new plants to grow, therefore adding to the already abundant foliage that shelters the capuchin.[citation needed]

Behavior

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A capuchin monkey (left) enjoying a massage from another capuchin monkey.

Like most New World monkeys, capuchins arediurnalandarboreal.Capuchins are polygamous, and the females mate throughout the year, but only go through a gestation period once every 2 years between December and April. Females bear young every two years following a 160- to 180-day gestation.[citation needed]The young cling to their mother's chest until they are larger, then they move to her back. Adult male capuchin rarely take part in caring for the young. Juveniles become fully mature within four years for females and eight years for males. In captivity, individuals have reached an age of 50 years, although natural life expectancy is only 15 to 25 years. Capuchins live in groups of 6–40 members, consisting of related females, their offspring, and several males.[citation needed]

White-fronted capuchin (Cebus albifrons)

Diet

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The capuchin monkey feeds on a vast range of food types, and is more varied than other monkeys in the familyCebidae.They areomnivores,and consume a variety of plant parts such as leaves, flower and fruit, seeds, pith, woody tissue, sugarcane, bulb, and exudates, as well asarthropods,molluscs,a variety ofvertebrates,and evenprimates.[15]Recent findings of old stone tools in Capuchin habitats have suggested that recently the Capuchins have switched from small nuts, such as cashews, to larger and harder nuts. Capuchins have also been observed to be particularly good at catching frogs.[15]They are characterized as innovative and extreme foragers because of their ability to acquire sustenance from a wide collection of unlikely food, which may assure their survival in habitats with extreme food limitation.[16]Capuchins living near water will also eat crabs and shellfish by cracking their shells with stones.[17]

Social structure

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Capuchin monkeys often live in large groups of 10 to 35 individuals within the forest, although they can easily adapt to places colonized by humans. The Capuchins have discrete hierarchies that are distinguished by age and sex.[18]Usually, a single male will dominate the group, and he will have primary rights tomatewith the females of the group. However, thewhite-headed capuchingroups are led by both an Alpha male and an Alpha female.[19]Each group will cover a large territory, since members must search for the best areas to feed. These primates are territorial animals, distinctly marking a central area of their territory with urine and defending it against intruders, though outer areas may overlap. The stabilization of group dynamics is served through mutual grooming, and communication occurs between the monkeys through various calls.[20]Their vocal communications have various meanings such as creating contact with one another, warning about a predator, and forming new groups. The social experience of the capuchins directly influences the development of attention in society. They create new social behaviors within multiple groups that signify different types of interactions. These include; tests of friendship, displays against enemies, infant and sexual intimacy.[21]This creates social rituals that are designed to test the strength of social bonds and a reliance on social learning.[22]

Mating

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Capuchin females often direct most of their proceptive and mating behavior towards the Alpha male. However, when the female reaches the end of her proceptive period, she may sometimes mate with up to six different subordinate males in one day.[23]Strictly targeting the Alpha male does not happen every time, as some females have been observed to mate with three to four different males.[24]When an Alpha female and a lower-ranking female want to mate with an Alpha male, the more dominant female will get rights to the male over the lower-ranking one.

Intelligence

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Crested capuchin(Sapajus robustus)

The capuchin is considered to be the most intelligent New World monkey[25]and is often kept in captivity. The tufted monkey is especially noted for its long-term tool usage,[26]one of the few examples of primate tool use other than byapesincluding humans. Upon seeingmacawseatingpalm nuts,cracking them open with their beaks, this monkey will select a few of the ripest fruits, nip off the tip of the fruit and drink down the juice, then seemingly discard the rest of the fruit with the nut inside. When these discarded fruits have hardened and become slightly brittle, the capuchin will gather them up again and take them to a large flat boulder where they have previously gathered a few river stones from up to a mile away. They will then use these stones, some of them weighing as much as the monkeys, to crack open the fruit to get to the nut inside. Young capuchins will watch this process to learn from the older, more experienced adults but it takes them 8 years to master this.[27]The learning behavior of capuchins has been demonstrated to be directly linked to a reward rather than curiosity.[28]

In 2005, experiments were conducted on the ability of capuchins to use money.[29]After several months of training, the monkeys began exhibiting behaviors considered to reflect an understanding of the concept of a medium of exchange that were previously believed to be restricted to humans (such as responding rationally to price shocks).[29]They showed the same propensity toavoid perceived lossesdemonstrated by human subjects and investors.

During the mosquito season, they crushmillipedesand rub the result on their backs. This acts as a naturalinsect repellent.[30]

Self-awareness

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Further information:Self-awareness

When presented with a reflection, capuchin monkeys react in a way that indicates an intermediate state between seeing the mirror as another individual and recognizing the image as self.

Most animals react to seeing their reflections as if encountering another individual they do not recognize. An experiment with capuchins shows that they react to a reflection as a strange phenomenon, but not as if seeing a strange capuchin.

In the experiment, capuchins were presented with three different scenarios:

  1. Seeing an unfamiliar, same-sex monkey on the other side of a clear barrier.
  2. Seeing a familiar, same-sex monkey on the other side of a clear barrier.
  3. A mirror showing a reflection of the monkey.

In scenario 1, females appeared anxious and avoided eye-contact, while males made threatening gestures. In scenario 2, there was little reaction by either males or females.

When presented with a reflection, females gazed into their own eyes and made friendly gestures, such as lip-smacking and swaying. Males made more eye contact than with strangers or familiar monkeys but reacted with signs of confusion or distress, such as squealing, curling up on the floor, or trying to escape from the test room.[31]

Theory of mind

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Main article:Theory of mind

The question of whether capuchin monkeys have a theory of mind—whether they can understand what another creature may know or think—has been neither proven nor disproven conclusively. If confronted with aknower-guesserscenario, where one trainer can be observed to know the location of food and another trainer merely guesses the location of food, capuchin monkeys can learn to rely on the knower.[32]This has, however, been repudiated as conclusive evidence for a theory of mind as the monkeys may have learned to discriminate knower and guess by other means.[33]Until recently it was believed that non-humangreat apesdid not possess a theory of mind either, although recent research indicates this may not be correct.[34]Human children commonly develop a theory of mind around the ages 3 and 4.

Threats

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Capuchin monkeys are threatened by deforestation, thepet trade,and humans hunting for bushmeat.[7]According to theIUCN Red List of Threatened Species,nearly all species are decreasing in population, with many facing threats of extinction.[35]Since capuchins have a high reproductive rate and can adapt to different living environments, they can survive forest loss more than some other species; however,habitat fragmentationis still a threat.[36]Predators include jaguars, cougars,jaguarundis,coyotes,tayras,snakes, crocodiles, birds of prey, and humans. The main predator of thetufted capuchinis theharpy eagle,which has been seen bringing several capuchin back to its nest.[1]

Relationship with humans

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19th-century organ grinder and his capuchin monkey

Easily recognized as the "organ grinder"or"greyhound jockey"monkeys, capuchins are sometimes kept asexotic pets.Sometimes they plunder fields and crops and are seen as troublesome by nearby human populations.[1]In some regions, they have become rare due to the destruction of their habitat.[1]

Capuchins have been used as service animals, and were once referred to as "nature's butlers" by the AARP.[37]Helping Hands, a nonprofit organization, trained capuchin monkeys to assistquadriplegicsasmonkey helpersin a manner similar tomobility assistance dogs.[37]

In 2010, the U.S. federal government revised its definition of service animal under the Americans with Disabilities Act (ADA). Non-human primates are no longer recognized as service animals under the ADA.[38]The American Veterinary Medical Association does not support the use of nonhuman primates as assistance animals because of animal welfare concerns, the potential for serious injury to people, and risks that primates may transfer dangerous diseases to humans.[39]In 2021, Helping Hands (the organization that provided helper monkeys to disabled persons) rebranded, changing its name to Envisioning Access and replaced the use of monkeys with a focus on new assistive technologies.[40]

Capuchin monkeys are the most common featuredmonkeysin film and television, with notable examples including:Night at the Museum(and its sequels),Outbreak,Monkey Shines,Pirates of the Caribbean: The Curse of the Black Pearl(and its sequels),Zookeeper,George of the Jungle,andThe Hangover Part II.Ross Geller(David Schwimmer) on theNBCsitcomFriendshad a capuchin monkey named Marcel.Crystal the Monkeyis a famous monkey actress.

References

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  1. ^abcdFragaszy, Dorothy M.; Visalberghi, Elisabetta; Fedigan, Linda M. (21 June 2004).The Complete Capuchin: The Biology of the GenusCebus.Cambridge University Press. p. 5.ISBN978-0-521-66768-5.
  2. ^Saint-Hilaire, E. G.; Cuvier, F. G. (1924).Histoire Naturelle des Mammifères.Paris, impr. de C. de Lasteyrie.OCLC166026273.
  3. ^Rossiter, William (1879).An illustrated dictionary of scientific terms.London & Glasgow: William Collins, Sons, and Company.ISBN978-0-548-93307-7.
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  5. ^Rylands, A. B.; Kierulff, M. C. M.; Mittermeier, R. A. (2005)."Notes on the taxonomy and distributions of the tufted capuchin monkeys (Cebus,Cebidae) of South America "(PDF).Lundiana.6(supp): 97–110.doi:10.35699/2675-5327.2005.22130.
  6. ^abSilva Jr., J. de S. (2001).Especiação nos macacos-prego e caiararas, gêneroCebusErxleben, 1777 (Primates, Cebidae).PhD thesis, Rio de Janeiro, Universidade Federal do Rio de Janeiro.
  7. ^abIUCN(2008).2008 IUCN Red List of Threatened Species.Accessed 23 November 2008
  8. ^abLynch Alfaro, J.W.; et al. (2011)."Explosive Pleistocene range expansion leads to widespread Amazonian sympatry between robust and gracile capuchin monkeys"(PDF).Journal of Biogeography.39(2): 272–288.doi:10.1111/j.1365-2699.2011.02609.x.S2CID13791283.Archived fromthe original(PDF)on 2015-02-26.
  9. ^abcLynch Alfaro, J.W.; Silva, j.; Rylands, A.B. (2012). "How Different Are Robust and Gracile Capuchin Monkeys? An Argument for the Use ofSapajusandCebus".American Journal of Primatology.74(4): 1–14.doi:10.1002/ajp.22007.PMID22328205.S2CID18840598.
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  13. ^de Oliveira, M. M.; Langguth, A. (2006)."Rediscovery of Marcgrave's capuchin monkey and designation of a neotype forSimia flaviaSchreber, 1774 (Primates, Cebidae) "(PDF).Boletim do Museu Nacional (Rio de Janeiro), Zoologia.Nova Série (523): 1–16. Archived fromthe original(PDF)on 2009-02-05.See also:Mendes Pontes, A. R.; Malta, A. & Asfora, P. H. (2006)."A new species of capuchin monkey, genusCebusErxleben (Cebidae, Primates): found at the very brink of extinction in the Pernambuco Endemism Centre "(PDF).Zootaxa(1200): 1–12.
  14. ^Bloch, Jonathan I.; Woodruff, Emily D.; Wood, Aaron R.; Rincon, Aldo F.; Harrington, Arianna R.; Morgan, Gary S.; Foster, David A.; Montes, Camilo; Jaramillo, Carlos A.; Jud, Nathan A.; Jones, Douglas S.; MacFadden, Bruce J. (2016). "First North American fossil monkey and early Miocene tropical biotic interchange".Nature.533(7602): 243–246.Bibcode:2016Natur.533..243B.doi:10.1038/nature17415.PMID27096364.S2CID4445687.
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  16. ^Fragaszy, Dorothy M.; Visalberghi, Elisabetta; Fedigan, Linda M. (21 June 2004)."Behavioral ecology: how do capuchins make a living?".The Complete Capuchin: The Biology of the GenusCebus.Cambridge University Press. pp. 36–.ISBN978-0-521-66768-5.
  17. ^Port-Carvalhoa, M.; Ferraria, S. F.; Magalhãesc, C. (2004). "Predation of Crabs by Tufted Capuchins (Cebus apella) in Eastern Amazonia ".Folia Primatol.75(3): 154–156.doi:10.1159/000078305.PMID15240980.S2CID1647323.
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  20. ^Van Belle, Sarie; Estrada, Alejandro; Garber, Paul A. (2012). "Collective group movement and leadership in wild black howler monkeys (Alouatta pigra) ".Behavioral Ecology and Sociobiology.67:31–41.doi:10.1007/s00265-012-1421-5.S2CID14844073.
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  22. ^Fragaszy, Dorothy M.; Eshchar, Yonat; Visalberghi, Elisabetta; Resende, Briseida; Laity, Kellie; Izar, Patrícia (2017-07-25)."Synchronized practice helps bearded capuchin monkeys learn to extend attention while learning a tradition".Proceedings of the National Academy of Sciences.114(30): 7798–7805.Bibcode:2017PNAS..114.7798F.doi:10.1073/pnas.1621071114.ISSN0027-8424.PMC5544277.PMID28739944.
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