A
monkey is a
primate, either an
Old World monkey or a
New World monkey. There are about 260 known living
species of monkey. Many are arboreal, although there are species that live primarily on the ground, such as
baboons. Monkeys are generally considered to be intelligent. Unlike apes, monkeys usually have tails. Tailless monkeys may be called "apes", incorrectly according to modern usage; thus the tailless
Barbary macaque is called the "Barbary ape".
The New World monkeys are classified within the parvorder Platyrrhini, whereas the Old World monkeys (superfamily Cercopithecoidea) form part of the parvorder Catarrhini, which also includes the hominoids (apes and humans). Thus, scientifically speaking, monkeys are a paraphyletic group, meaning that although they are believed to have evolved from a single ancestral species, the group does not contain all the descendants of that ancestor. Old World monkeys are actually more closely related to homonids than they are to New World monkeys.
Historical and modern terminology
According to the
Oxford English 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. In English, no very clear distinction was originally made between "ape" and "monkey"; thus the 1910
Encyclopaedia Britannica entry for "ape" notes that it is either a synonym for "monkey" or is used to mean a tailless humanlike primate. Such confusions persist. Colloquially, the terms "monkeys" and "apes" may still be used interchangeably. Due to its size (up to ) the
Mandrill is often thought to be an ape, but it is actually an Old World monkey. Also, a few monkey species deceptively 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. 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 is not, since it excludes hominoids (apes and humans). Thus the term "monkey" no longer refers 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 (apes and humans), so that monkeys are, in terms of currently recognized taxa, non-hominoid simians.
A group of monkeys may be referred to as a ''mission'' or a ''tribe''.
Characteristics
Monkeys range in size from the
Pygmy Marmoset, at 140 to 160 millimetres (5–6 in) long (plus tail) and 120 to 140 grams (4–5 oz) in weight, to the male
Mandrill, almost long and weighing . 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).
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. Some have trichromatic color vision like that of humans, others are dichromats or monochromats. 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.
Classification
|2=Platyrrhini|barend2=green
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|2=Tarsiiformes
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|2=Strepsirrhini
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The following list shows where the various monkey families (bolded) are placed in the Primate classification.
ORDER PRIMATES
* Suborder Strepsirrhini: non-tarsier prosimians
* Suborder Haplorhini: tarsiers, monkeys and apes
** Infraorder Tarsiiformes
*** Family Tarsiidae: tarsiers
** Infraorder Simiiformes: simians
*** Parvorder Platyrrhini: New World monkeys
**** Family Cebidae: marmosets, tamarins, capuchins and squirrel monkeys (56 species)
**** Family Aotidae: night monkeys (8 species)
**** Family Pitheciidae: titis, sakis and uakaris (41 species)
**** Family Atelidae: howler, spider and woolly monkeys (24 species)
*** Parvorder Catarrhini
**** Superfamily Cercopithecoidea
***** Family Cercopithecidae: Old World monkeys (135 species)
**** Superfamily Hominoidea: apes
***** Family Hylobatidae: gibbons ("lesser apes") (13 species)
***** Family Hominidae: great apes including humans (7 species)
Relationship with humans
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 threatened 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. 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. Monkeys that have become habituated to human presence in tourist locations may also be considered pests, attacking tourists.
In religion and culture, the monkey often represents quick-wittedness and mischief.
As service animals for the disabled
Some organizations, for example ''Helping Hands: Monkey Helpers for the Disabled'', train
capuchin monkeys as
monkey helpers 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 quadriplegic. Around the house, the monkeys help out by doing tasks including microwaving food, washing the quadriplegic's face and opening drink bottles.
In experiments
Macaques, especially the
Rhesus Macaque, and African
Green Monkeys are widely used in
animal testing facilities, either wild-caught or purpose-bred. 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. In the
United States, around 50,000 non-human
primates, most of them monkeys, have been used in experiments every year since 1973; 10,000 monkeys were used in the
European Union in 2004.
The use of monkeys in laboratories is controversial. Animal rights activists claim that their use is cruel and produces little information of value, and there have been many protests, vandalism to testing facilities and threats to workers. Others claim that it has led to many important medical breakthroughs such as the rabies vaccine, understanding of human reproduction and basic knowledge about brain function and that the prevention of harm to humans should be a higher priority than the possible harm done to monkeys. The topic has become a popular cause for animal rights and animal welfare groups.
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.
As food
Monkey brains are eaten as a delicacy in South East Asia, China, and Africa. In traditional
Islamic dietary laws, the eating of monkeys is
forbidden. However, monkeys are sometimes eaten in parts of Africa, where they can be sold as "
bushmeat".
Literature
Sun Wukong (the "Monkey King"), a character who figures prominently in
Chinese mythology, is the main 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, the term "monkey" is often used more broadly than in scientific use, and may be used to 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.
The Winged monkeys are prominent characters in ''The Wizard of Oz''.
Religion and worship
Hanuman, a prominent divine entity in
Hinduism, is a monkey-like humanoid. He may bestow longevity.
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 ''Mizaru'' or three wise monkeys are revered in Japanese folklore.
The Moche people of ancient Peru worshipped nature. They placed emphasis on animals and often depicted monkeys in their art.
Entertainment
In the Tamil country, monkeys would be trained in gymnastics by their owners for public entertainment.
Kiki the Hyperactive Monkey of Sentosa an anthropomorphic green crab-eating macaque performs in the defunct live nighttime spectacular, Magical Sentosa which is located at, Sentosa Island, Singapore.
Zodiac
The
Monkey is the ninth in the twelve-year cycle of animals which appear in the
Chinese zodiac related to the
Chinese calendar. mod12}}
|1=Last year was the year of the monkey.
|0=This year is the year of the monkey.
|11=Next year will be the year of the monkey.
|The next time that the monkey will appear as the zodiac sign will be in the year +6)/12round0)*12}}}}.
See also
List of monkeys
List of New World monkey species
List of Old World monkey species
Signifying monkey
References
External links
"The Impossible Housing and Handling Conditions of Monkeys in Research Laboratories", by Viktor Reinhardt, International Primate Protection League, August 2001
The Problem with Pet Monkeys: Reasons Monkeys Do Not Make Good Pets, an article by veterinarian Lianne McLeod on About.com
Helping Hands: Monkey helpers for the disabled, a U.S. national non-profit organization based in Boston Massachusetts that places specially trained capuchin monkeys with people who are paralyzed or who live with other severe mobility impairments
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