Monkey | Definition, Characteristics, Types, Classification, & Facts (2024)

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Written by

Colin Peter Groves Professor of Biological Anthropology, Australian National University, Canberra. Author of A Theory of Human and Primate Evolution and others.

Colin Peter Groves

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Old World and New World monkeys

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monkey, in general, any of nearly 200 species of tailed primate, with the exception of lemurs, tarsiers, and lorises. The presence of a tail (even if only a tiny nub), along with their narrow-chested bodies and other features of the skeleton, distinguishes monkeys from apes. Most monkeys have a short, relatively flat face without great prominence of the muzzle, although baboons and mandrills are notable exceptions. The vast majority of species live in tropical forests, where they move on all four limbs. All but the durukuli of tropical Central and South America are active during the day, moving frequently in bands as they search for vegetation, birds’ eggs, smaller animals, and insects to eat. Monkeys are capable of sitting upright, and, consequently, their hands are freed for many manipulative tasks. Except for a few Old World forms, monkeys are predominantly arboreal, leaping from limb to limb in their travels among the trees. Their hands and feet are both used for grasping and typically have five digits, the thumb and big toe being divergent from the others. Commonly, the digits have flattened nails, but the marmosets have claws on all digits except the big toe, which bears a nail. On the ground, monkeys walk with the entire sole of the foot touching the ground but with the palm of the hand raised. They almost never walk on two legs (bipedally) and can stand erect for only short periods, if at all.

Monkeys have large brains and are known for their inquisitiveness and intelligence. Brain development, combined with the freeing of the hands and well-developed vision, allows them a great latitude of activity. Most are good at solving complex problems and learning from experience, but they do not quite reach the cognitive levels of great apes. Some, especially the capuchins (genus Cebus), spontaneously use objects as tools (e.g., stones to crack nuts). Others, such as baboons, readily learn to use sticks to obtain food. However, in strong contrast to the great apes (gorillas, chimpanzees, and orangutans), most monkeys do not appear to be very good at learning from each others’ experience—individuals more or less have to learn new behaviours for themselves. A significant exception is the Japanese macaque (Macaca fuscata). In field experiments, these monkeys were introduced to new foods such as sweet potatoes and candies wrapped in paper. Once a few individuals had solved the problems of getting at the new foods, their innovations gradually spread throughout entire troops. These experiments have had implications in redefining cultural behaviour.

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Monkeys are highly social animals, and almost all live in troops consisting of several females with young and either a single male (as in hamadryas baboons, mandrills, most guenons, and most langurs) or several males (as in savannah baboons and macaques). Usually, but not universally, the females stay in the troop in which they were born and are thus closely related to each other. Males join new troops on maturity, and so they are unrelated to each other and somewhat antagonistic. Like humans and apes, female monkeys nurse their young and have a menstrual cycle, albeit less copious. In some species, sexual activity is strictly confined to the period around ovulation (estrus); in others, there appears to be little or no restriction. Some species breed all year round; others have a period several months long during which they experience no sexual cycles (anestrus).

Old World monkeys versus New World monkeys

Monkeys are arranged into two main groups: Old World and New World. Old World monkeys all belong to one family, Cercopithecidae, which is related to apes and humans, and together they are classified as catarrhines (meaning “downward-nosed” in Latin). The New World monkeys are the platyrrhines (“flat-nosed”), a group comprising five families. As their taxonomic names suggest, New World (platyrrhine) and Old World (catarrhine) monkeys are distinguished by the form of the nose. New World monkeys have broad noses with a wide septum separating outwardly directed nostrils, whereas Old World monkeys have narrow noses with a thin septum and downward-facing nostrils, as do apes and humans. Old World monkeys have hard, bare “sitting pads” (ischial callosities) on the buttocks; New World monkeys lack these. Many Old World monkeys have thumbs that can be opposed to the other fingers and so can handle small objects precisely. None of the New World monkeys has such manual dexterity. Indeed, in the hands of many species, the main divergence is between the index and middle fingers; in a few species, the thumb is reduced or even absent. Some New World monkey species have prehensile tails capable of supporting the entire body weight or of grasping, for example, a proffered peanut. No Old World monkeys have this ability, and macaques are nearly tailless.

New World monkeys live primarily in tropical South America, especially the Amazon rainforests; the range of a few species extends northward as far as southern Mexico or southward into northern Argentina. Among the smaller New World forms that have endeared themselves to humans with their antics and their tamability are the alert marmosets, often tufted and colourfully arrayed, and the inquisitive squirrel, woolly, and capuchin monkeys—all of which exhibit in marked degree the curiosity and cleverness ascribed to monkeys generally. Larger New World species include the acrobatic spider monkeys and the noisy howlers. Other New World monkeys include uakaris, sakis, and titis.

Old World monkeys live throughout Africa, on the Red Sea coast of Arabia, and in Asia from Afghanistan to Japan and southeast to the islands of the Philippines, Celebes, Bacan, and Timor. Some Old World monkeys have been successfully naturalized in Gibraltar, France, Mauritius, Belau, and a few islands of the West Indies. Old World monkeys include many that are often seen in zoos, especially the beautifully coloured African guenons (e.g., mona, diana, white-nosed, green, vervet, and grivet monkeys), colobus, mangabeys, and the chiefly Asiatic macaques. The macaques include the Barbary “ape” of North Africa and the Rock of Gibraltar—the only macaque outside Asia and the only wild monkey inhabiting any part of Europe today—and the rhesus monkey of the Indian subcontinent, which has been used considerably in medical research. The graceful langurs include the hanuman, or sacred monkey, also of southern Asia. Among the more unusual monkeys are the large and strikingly coloured African drills and mandrills, the proboscis monkey of Borneo, and the rare and bizarre snub-nosed monkeys of China and Vietnam. The Old World monkeys are divided into two subfamilies: Cercopithecinae and Colobinae. The cercopithecines have cheek pouches, in which they store food; these include baboons, macaques, guenons, and their relatives. The colobines lack cheek pouches but have complicated three- or four-chambered stomachs, where bacterial fermentation of cellulose and hemicellulose occurs and thereby enriches the nutrient content of their diet, which consists partially of leaves and seeds. Colobines include colobus monkeys, langurs, and their relatives.

Monkey | Definition, Characteristics, Types, Classification, & Facts (9)

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Because the ecological niches that they occupy are similar, there are many parallels between Old and New World monkeys. In particular, the squirrel monkeys (genus Saimiri) of the New World and the talapoin (genus Miopithecus) of West-Central Africa are remarkably convergent; both are small (about 1 kg [2.2 pounds]) and greenish, live in large troops along rivers, and breed seasonally. Other aspects of each group’s evolution, however, are unique. No New World monkey lives on the savanna or has a multichambered cellulose-fermenting stomach, and no Old World monkey is nocturnal like the durukuli. The closest analogue to the complex society of the spider monkey is found not in an Old World monkey but in the chimpanzee.

Classification

  • Family Cercopithecidae (Old World monkeys)
    103 or more species in 21 genera from Africa and Asia. The number of species stated within a given genus may vary, depending on the taxonomic criteria used.
    • Subfamily Cercopithecinae
      63 or more species in 11 genera.
      • Cercopithecus (guenons)
        20 or more African species.
      • Macaca (macaques)
        20 or so Asian and African species.
      • Cercocebus (mangabeys)
        7 African species.
      • Papio (baboons)
        5 African and Arabian species.
      • Lophocebus (mangabeys)
        3 African species.
      • Mandrillus (drills and mandrills)
        2 African species.
      • Miopithecus (talapoins)
        2 African species.
      • Allenopithecus (Allen’s swamp monkey)
        1 African species.
      • Chlorocebus (vervet, or green monkey)
        1 to 6 African species.
      • Erythrocebus (patas monkey)
        1 African species.
      • Theropithecus (gelada)
        1 African species.
    • Subfamily Colobinae
      40 or more species in 10 genera.
      • Trachypithecus (brow-ridged langurs)
        10 or more Southeast Asian species.
      • Presbytis (leaf monkeys)
        8 Southeast Asian species.
      • Colobus (black-and-white colobus monkeys)
        5 African species.
      • Procolobus (olive colobus monkeys)
        5 to 10 African species.
      • Rhinopithecus (snub-nosed monkeys)
        4 Asian species.
      • Pygathrix (doucs)
        3 continental Southeast Asian species.
      • Semnopithecus
        2 to 8 South Asian species, including the Hanuman langur.
      • Nasalis (proboscis monkey)
        1 Indonesian species.
      • Procolobus (red colobus monkey)
        1 African species.
      • Simias (simakobu, or pig-tailed langur)
        1 Indonesian species.
  • Platyrrhinii (New World monkeys)
    94 or more species in 5 families from tropical Central and South America. The number of species stated within a given genus may vary, depending on the taxonomic criteria used. Formerly, only two families were recognized within the group: Callitrichidae (marmosets and tamarins) and Cebidae (all others, including capuchins, titis, squirrel monkeys, and howler monkeys). Molecular evidence, together with reassessments of morphological evidence, now indicates that marmosets are more related to the capuchins, with spider monkeys and their relatives being more divergent. Recent classifications, therefore, tend to recognize additional families: Atelidae (spider monkeys and their relatives), Pitheciidae (sakis and uakaris), and Aotidae (durukulis); Callitrichidae and Aotidae are sometimes lumped into the Cebidae.
    • Family Callitrichidae (marmosets and tamarins)
      27 or more species in 4 genera. Sometimes included in the family Cebidae as a subfamily.
      • Saguinus (tamarins)
        12 or more species.
      • Callithrix (“true” marmosets)
        10 to 20 species.
      • Leontopithecus (lion tamarins)
        4 species.
      • Callimico (Goeldi’s monkey)
        1 species.
    • Family Pitheciidae
      29 or so species in 4 genera.
      • Subfamily Callicebinae
        • Callicebus (titis)
          20 or so species.
      • Subfamily Pitheciinae (sakis and uakaris)
        • Pithecia (sakis)
          5 species.
        • Chiropotes (bearded sakis)
          2 species.
        • Cacajao (uakaris)
          2 species.
    • Family Atelidae
      19 or more species in 5 genera.
      • Subfamily Atelinae (spider and woolly monkeys)
        • Ateles (spider monkeys)
          4 to 8 species.
        • Lagothrix (woolly monkeys)
          4 species.
        • Brachyteles (muriquis, or woolly spider monkeys)
          2 species.
        • Oreonax (yellow-tailed, or Hendee’s, woolly monkey)
          1 species.
    • Family Cebidae (capuchin and squirrel monkeys)
      10 or more species in 2 genera.
      • Cebus (capuchin monkeys)
        5 to 8 species.
      • Saimiri (squirrel monkeys)
        5 to 8 species.
    • Family Aotidae
      • Aotus (durukulis, or night monkeys)
        9 species.
Colin Peter Groves
Monkey | Definition, Characteristics, Types, Classification, & Facts (2024)

FAQs

Monkey | Definition, Characteristics, Types, Classification, & Facts? ›

monkey, in general, any of nearly 200 species of tailed primate, with the exception of lemurs, tarsiers, and lorises. The presence of a tail (even if only a tiny nub), along with their narrow-chested bodies and other features of the skeleton, distinguishes monkeys from apes.

What are the 7 levels of classification for a monkey? ›

Classification
  • Kingdom: Animalia.
  • Phylum: Chordata.
  • Class: Mammalia.
  • Infraclass: Eutheria.
  • Order: Primates.
  • Family: Cercopithecidae.
  • Subfamily: Cercopithecinae.
  • Genus: Erythrocebus.
Aug 20, 2024

What are the characteristics of a monkey? ›

Most species are arboreal, using all four limbs to leap from tree to tree. They can sit upright and stand erect. Most species run along branches rather than swinging arm over arm like the apes. Monkeys are highly social omnivores, organized in clans as large as several hundred individuals headed by an old male.

What is a monkey classified as? ›

Monkey
Monkeys Temporal range:
Kingdom:Animalia
Phylum:Chordata
Class:Mammalia
Order:Primates
10 more rows

What are 10 facts about monkeys? ›

Monkey Facts
  • Monkey is a familiar name for a group of primate mammals.
  • They live both on the ground and in the trees.
  • Most monkeys have tails.
  • Apes are not monkeys.
  • Groups of monkeys are known as a mission, tribe, or troop.
  • They have to stay away from animals like big snake, crocodiles, and leopards.

Are monkeys mammals yes or no? ›

Mammals are a group of vertebrate animals. Examples of mammals include rats, cats, dogs, deer, monkeys, apes, bats, whales, dolphins, and humans. Figure 6.2 shows some examples of mammals.

How intelligent is a monkey? ›

Monkeys are not quite as intelligent as human beings, but it is thought that their intelligence is equivalent to that of a three year old human child. The reason for the difference in intelligence is thought to be due to the rapid growth of white matter in the brains of toddler humans.

What is the life expectancy of a monkey? ›

Generally, monkeys can live 20 to 40 years, so they are a long-term commitment. A monkey's life span will also depend on their species. A chimpanzee can live 50 years or more, while a capuchin can live 15 to 25 years.

What do monkeys do all day? ›

Monkeys spend their time looking for food, socializing, and watching for predators. While every species has its own daily routine, here's a basic rundown of common behaviors: Many species of monkeys sleep in large groups for protection. They wake up and slowly spread out, foraging for plants or insects to eat.

What kind of food do monkeys eat? ›

In the wild, rhesus monkeys thrive on fruits, seeds, roots, herbs and insects. In captivity, monkeys primarily eat monkey chow, and an array of fresh, seasonal fruit, vegetables and nuts once to twice a week to provide them with variety and to supplement their diet (photo below).

What is the gender of a monkey? ›

Monkey is a common noun that is used to talk about both the males and females of the species. Monkeys are haplorhine ("dry-nosed") primates. There is no specific word for female monkey. The female monkey is called 'FEMALE MONKEY'; and the male monkey is called 'MALE MONKEY'.

Is a gorilla a monkey? ›

Is A Gorilla A Monkey Or Ape? Almost all monkeys have tails. Apes don't have tails. Since gorillas don't have tails (this is starting to feel like a math problem), they are classified as apes.

What makes monkeys happy? ›

We discovered that doing grooming makes monkeys feel relaxed, and that even observing others groom has the same effect. These findings suggest that for monkeys, being nice—or just watching others being nice—makes them feel good.

Do monkeys recognize humans? ›

Nonhuman primates posses a highly developed capacity for face recognition, which resembles the human capacity both cognitively and neurologically. Face recognition is typically tested by having subjects compare facial images, whereas there has been virtually no attention to how they connect these images to reality.

What special skills do monkeys have? ›

Monkeys have large brains and are known for their inquisitiveness and intelligence. Brain development, combined with the freeing of the hands and well-developed vision, allows them a great latitude of activity.

What are the 7 levels of classification for species? ›

The seven levels of taxonomy from broadest to most specific are:
  • Kingdom.
  • Phylum.
  • Class.
  • Order.
  • Family.
  • Genus.
  • Species.

What is the 7 monkey theory? ›

They shared a strategy they have been using called 'The 7 Monkeys'. The 7 Monkeys is a way of enabling students to learn a concept, process or idea independently with minimal teacher input. Each 'monkey' is a different activity that the students undertake to support their learning.

What are the 7 levels of classification for a gorilla? ›

Classification
  • Describer : Savage & Wyman (1847). Boston Journal of Natural History, 5:417.
  • Kingdom: Animal.
  • Phylum: Chordata.
  • Class: Mammalia.
  • Order: Primates.
  • Family: Hominidae.
  • Subfamily: Homininae.
  • Genus: Gorilla.
Aug 20, 2024

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