Monkey

Monkeys
Temporal range: Late Eocene–Present[1]
Wild toque macaque (Macaca sinica) in Yala National Park, Sri Lanka
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Primates
Suborder: Haplorhini
Infraorder: Simiiformes
[lower-alpha 1]
Groups included
Platyrrhini
Cercopithecidae
†Parapithecidae
Cladistically included but traditionally excluded taxa
Hominoidea
For other uses, see Monkey (disambiguation).
For the monophyletic clade, see Simian.

Monkey is a common name that may refer to groups or species of mammals, in part, the simians of infraorder Simiiformes. The term is applied descriptively to groups of primates, such as families of New World monkeys and Old World monkeys. Many monkey species are tree-dwelling (arboreal), although there are species that live primarily on the ground, such as baboons. Most species are also active during the day (diurnal). Monkeys are generally considered to be intelligent, especially the Old World monkeys of Catarrhini.

Simians and tarsiers emerged within haplorrhines some 60 million years ago. New World monkeys and catarrhine monkeys emerged within the simians some 35 million years ago. Old World monkeys and Hominoidea emerged within the catarrhine monkeys some 25 million years ago. Extinct basal simians such as Aegyptopithecus or Parapithecus [35-32 million years ago], eosimiidea and sometimes even the Catarrhini group are also considered monkeys by primatologists.[3][4][5][6][7][8][9]

Lemurs, lorises, and galagos are not monkeys; instead they are strepsirrhine primates. Like monkeys, tarsiers are haplorhine primates; however, they are also not monkeys.

Apes emerged within "monkeys" as sister of the Cercopithecidae in the Catarrhini, so cladistically they are monkeys as well. There has been resistance to directly designate apes (and thus humans) as monkeys, so "Old World monkey" may be taken to mean the Cercopithecoidea or the Catarrhini.[10][11][12][13][14][15][9][16][17] That apes are monkeys was already realized by Georges-Louis Leclerc, Comte de Buffon in the 18th century.[18][19]

Monkeys, including apes, can be distinguished from other primates by having only two pectoral nipples, a pendulous penis, and a lack of sensory whiskers.[20]

Historical and modern terminology

According to the Online Etymology Dictionary, the word "monkey" may originate in a German version of the Reynard the Fox fable, published circa 1580. In this version of the fable, a character named Moneke is the son of Martin the Ape.[21] In English, no very clear distinction was originally made between "ape" and "monkey"; thus the 1911 Encyclopædia Britannica entry for "ape" notes that it is either a synonym for "monkey" or is used to mean a tailless humanlike primate.[22] Colloquially, the terms "monkey" and "ape" are widely used interchangeably.[23] Also, a few monkey species have the word "ape" in their common name, such as the Barbary ape.

Later in the first half of the 20th century, the idea developed that there were trends in primate evolution and that the living members of the order could be arranged in a series, leading through "monkeys" and "apes" to humans.[24] Monkeys thus constituted a "grade" on the path to humans and were distinguished from "apes".

Scientific classifications are now more often based on monophyletic groups, that is groups consisting of all the descendants of a common ancestor. The New World monkeys and the Old World monkeys are each monophyletic groups, but their combination was not, since it excluded hominoids (apes and humans). Thus the term "monkey" no longer referred to a recognized scientific taxon. The smallest accepted taxon which contains all the monkeys is the infraorder Simiiformes, or simians. However this also contains the hominoids, so that monkeys are, in terms of currently recognized taxa, non-hominoid simians. Colloquially and pop-culturally, the term is ambiguous and sometimes monkey includes non-human hominoids.[25] In addition, frequent arguments are made for a monophyletic usage of the word "monkey" from the perspective that usage should reflect cladistics.[26][27][28][29][30]

A group of monkeys may be commonly referred to as a tribe or a troop.[31]

Two separate groups of primates are referred to as "monkeys": New World monkeys (platyrrhines) from South and Central America and Old World monkeys (catarrhines in the superfamily Cercopithecoidea) from Africa and Asia. Apes (hominoids)—consisting of gibbons, orangutans, gorillas, chimpanzees, and humans—are also catarrhines but were classically distinguished from monkeys.[32][33][34][35] (Tailless monkeys may be called "apes", incorrectly according to modern usage; thus the tailless Barbary macaque is sometimes called the "Barbary ape".)

Description

As apes have emerged in the monkey group as sister of the old world monkeys, characteristics that describe monkeys are generally shared by apes as well. Williams et al outlined evolutionary features, including in stem groupings, contrasted against the other primates such as the tarsiers and the lemuriformes.[36]

Monkeys range in size from the pygmy marmoset, which can be as small as 117 millimetres (4.6 in) with a 172-millimetre (6.8 in) tail and just over 100 grams (3.5 oz) in weight,[37] to the male mandrill, almost 1 metre (3.3 ft) long and weighing up to 36 kilograms (79 lb).[38] Some are arboreal (living in trees) while others live on the savanna; diets differ among the various species but may contain any of the following: fruit, leaves, seeds, nuts, flowers, eggs and small animals (including insects and spiders).[39]

Some characteristics are shared among the groups; most New World monkeys have prehensile tails while Old World monkeys have non-prehensile tails or no visible tail at all. Old World monkeys have trichromatic color vision like that of humans, while New World monkeys may be trichromatic, dichromatic, or—as in the owl monkeys and greater galagos—monochromatic. Although both the New and Old World monkeys, like the apes, have forward-facing eyes, the faces of Old World and New World monkeys look very different, though again, each group shares some features such as the types of noses, cheeks and rumps.[39]

Classification

The following list shows where the various monkey families (bolded) are placed in the classification of living (extant) primates.

Cladogram with extinct families

Below is a cladogram with some extinct monkey families.[40][41][42] Generally, extinct non-hominoid simians, including early Catarrhines are discussed as monkeys as well as simians or anthropoids,[32][33][34] which cladistically means that Hominoidea are monkeys as well, restoring monkeys as a single grouping. It is indicated approximately how many million years ago (Mya) the clades diverged into newer clades.[43][44][45][46] It is thought the New World monkeys started as a drifted "Old World monkey" group from the old world (probably Africa) to the new world (South America).[33]

Haplorhini (64)
 

Tarsiiformes

 
Simian
 

Eosimiidae s.s. (†37)

 
 
 

Phileosimias (†46)

 
 
 

Amphipithecidae (†35)

 
(45)
 

Parapithecoidea (†30)

 
 
 

Proteopithecidae (†34)

 
Crown
Platyrrhini (30)
(29)
 

Chilecebus (†20)

 
(26)
 

Tremacebus (†20)

 
(24)
 

Homunculus (†16)

 
 

Dolichocebus (†20)

 
 
 
 
 

Crown Platyrrhini (New World Monkeys)

 
 
Catarrhini (35)
 

Oligopithecidae (†34)

 
(35)
 

Propliopithecoidea (†30)

 
(34)
 

Pliopithecoidea (†6)

 
(32)
 

Micropithecus (†15)

 
Crown
Hominoidea (30)
 

Proconsulidae (†18)

 
(29)
 

Equatorius (†16)

 
(29)
Afropithecidae (28)
 

Morotopithecus (†20)

 
(28)
 

Afropithecus (†16)

 
 

Nyanzapithecinae (†7)

 
 
 
Crown Hominoidea (22)
 

Hominidae

 
 

Hylobatidae

 
 
 
 
 
(29)
 

Saadanioidea (†28)

 
Cercopithecoidea (24)
 

Victoriapithecinae(†19)

 
 

Crown Cercopithecoidea (Old World Monkeys)

 
 
 
Catharrhini (31)
 
 
 
 
Simians (40)
 
 
 
 
(Monkeys, Anthropoids, 47)
 
Various species of monkey

Relationship with humans
Macaque on a "Please do not feed monkeys" sign in Ko Chang, Thailand.

The many species of monkey have varied relationships with humans. Some are kept as pets, others used as model organisms in laboratories or in space missions. They may be killed in monkey drives (when they threaten agriculture) or used as service animals for the disabled.

In some areas, some species of monkey are considered agricultural pests, and can cause extensive damage to commercial and subsistence crops.[47][48] This can have important implications for the conservation of endangered species, which may be subject to persecution. In some instances farmers' perceptions of the damage may exceed the actual damage.[49] Monkeys that have become habituated to human presence in tourist locations may also be considered pests, attacking tourists.[50]

In popular culture monkeys are a symbol of playfulness, mischief and fun.[51]

As service animals for disabled persons
See also: Service animal § Helper monkeys

Some organizations train capuchin monkeys as service animals to assist quadriplegics and other people with severe spinal cord injuries or mobility impairments. After being socialized in a human home as infants, the monkeys undergo extensive training before being placed with a disabled persons. Around the house, the monkeys assist with daily tasks such as feeding, fetching, manipulating objects, and personal care.[52]

Helper monkeys are usually trained in schools by private organizations, taking seven years to train, and are able to serve 25–30 years (two to three times longer than a guide dog).[53]

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.[54] The American Veterinary Medical Association does not support the use of non-human 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.[55]

In experiments
Main article: Animal testing on non-human primates

The most common monkey species found in animal research are the grivet, the rhesus macaque, and the crab-eating macaque, which are either wild-caught or purpose-bred.[56][57] They are used primarily because of their relative ease of handling, their fast reproductive cycle (compared to apes) and their psychological and physical similarity to humans. Worldwide, it is thought that between 100,000 and 200,000 non-human primates are used in research each year,[57] 64.7% of which are Old World monkeys, and 5.5% New World monkeys.[58] This number makes a very small fraction of all animals used in research.[57] Between 1994 and 2004 the United States has used an average of 54,000 non-human primates, while around 10,000 non-human primates were used in the European Union in 2002.[58]

In space
Sam, a rhesus macaque, was flown to a height of 55 miles (89 km) by NASA in 1959
Main article: Monkeys and apes in space

A number of countries have used monkeys as part of their space exploration programmes, including the United States and France. The first monkey in space was Albert II, who flew in the US-launched V-2 rocket on June 14, 1949.[59]

As food
Main article: Monkey meat

Monkey brains are eaten as a delicacy in parts of South Asia, Africa and China.[60] Monkeys are sometimes eaten in parts of Africa, where they can be sold as "bushmeat". In traditional Islamic dietary laws, the eating of monkeys is forbidden.[61]

Literature
Illustration of Indian monkeys known as bandar from the illuminated manuscript Baburnama (Memoirs of Babur)

Sun Wukong (the "Monkey King"), a character who figures prominently in Chinese mythology, is the protagonist in the classic comic Chinese novel Journey to the West.

Monkeys are prevalent in numerous books, television programs, and movies. The television series Monkey and the literary characters Monsieur Eek and Curious George are all examples.

Informally, "monkey" may refer to apes, particularly chimpanzees, gibbons, and gorillas. Author Terry Pratchett alludes to this difference in usage in his Discworld novels, in which the Librarian of the Unseen University is an orangutan who gets very violent if referred to as a monkey. Another example is the use of Simians in Chinese poetry.

The winged monkeys are prominent characters in L. Frank Baum's Wizard of Oz books and in the 1939 film based on Baum's 1900 novel The Wonderful Wizard of Oz.

Religion and worship
Abhinandananatha with his symbol of monkey below his idol

Monkey is the symbol of fourth Tirthankara in Jainism, Abhinandananatha.[62][63]

Hanuman, a prominent deity in Hinduism, is a human-like monkey god who is believed to bestow courage, strength and longevity to the person who thinks about him or Rama.

In Buddhism, the monkey is an early incarnation of Buddha but may also represent trickery and ugliness. The Chinese Buddhist "mind monkey" metaphor refers to the unsettled, restless state of human mind. Monkey is also one of the Three Senseless Creatures, symbolizing greed, with the tiger representing anger and the deer lovesickness.

The Sanzaru, or three wise monkeys, are revered in Japanese folklore; together they embody the proverbial principle to "see no evil, hear no evil, speak no evil".[64]

The Moche people of ancient Peru worshipped nature.[65] They placed emphasis on animals and often depicted monkeys in their art.[66]

The Tzeltal people of Mexico worshipped monkeys as incarnations of their dead ancestors.

Zodiac
Monkeys as Judges of Art, an ironical 1889 painting by Gabriel von Max.

The Monkey (猴) is the ninth in the twelve-year cycle of animals which appear in the Chinese zodiac related to the Chinese calendar. The next time that the monkey will appear as the zodiac sign will be in the year 2028.[67]

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See also

Notes
  1. When Carl Linnaeus defined the genus Simia in the 10th edition of Systema Naturae, it included all non-human monkeys and apes (simians).[2] Although "monkey" was never a taxonomic name, and is instead a vernacular name for a paraphyletic group, its members fall under the infraorder Simiiformes.

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Literature cited

Further reading
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