101 Facts… Monkeys!

White face monkey at Palo Verde-1
White face monkey at Palo Verde. Image credit: John Trainor cc2.0

101 Facts… Monkeys by IP Factly
Amazing Animal WebBooks

101 Monkey Facts

101 Facts… Monkeys!

Over 101 cool facts in this book about some of our nearest relatives in the animal kingdom – monkeys.


New World Monkeys
Old World Monkeys
Bald uakari
Barbary macaque
Capuchin monkey
Cotton-top tamarin
Crab-eating macaque
Douc monkey
Gee’s golden langur
Golden lion tamarin
Howler monkey
Japanese macaque
Proboscis monkey
Pygmy marmoset
Rhesus macaque
Spider monkey
Squirrel monkey
Vervet monkey
Other Monkey Species
Monkeys and Humans
Final Facts
Photo Credits


Monkeys belong to the order of mammals called primates. Humans also belong to this order, along with apes, tarsiers, lorises, and lemurs.

Monkey near the Nahargarh Fort by Kevin Jones

Monkeys often live in groups. A group of monkeys is called a troop, which can consist of up to 500 individuals. Some troops come together to form larger groups called tribes.

Baby monkeys are called infants, just like human babies. Like human babies, they are born with their eyes closed and without any teeth. They are quite helpless, which is why they cling to their mother’s belly during the first few weeks of life.

Monkey family by Nathan Clement

Monkeys communicate in various ways. They make different sounds like screeches and hoots in order to alert others to danger and to keep other monkeys away from their territory. They can also use body language. For example, they bob their heads to show that they are angry, or smack their lips to show that they are happy.

A monkey’s average day is spent looking for food, eating, resting or sleeping, and grooming. Grooming is not just a way for monkeys to keep each other clean, but also to strengthen their bonds.

Cleaning monkeys by Ross Hawkes

Monkeys are omnivorous, meaning they eat both plants and other animals. They prefer to eat plants, though–specifically fruits, leaves, and nuts, while eating insects, bird eggs, spiders, snails, and lizards on occasion.

The average lifespan of a monkey depends on its species. Some monkeys live for only ten years, while others can live for up to fifty years.

New World Monkeys

Monkeys are classified into two types – New World monkeys and Old World monkeys. New World monkeys can be found mostly in Central and South America.

New World monkeys tend to be smaller than Old World monkeys. In fact, most New World monkeys are less than two feet long.

Lazing capuchin monkeys by Vytautas Šėrys

New World monkeys have noses that are flat and narrow, with nostrils pointing toward the sides. The name of their superfamily, Platyrrhini, means ‘flat-nosed’.

New World monkeys have long tails that can grow almost as long as their bodies and are sometimes prehensile. Prehensile means that the tail is able to grasp objects like tree branches or leaves.

White fronted capuchin monkey by Geoff Gallice

When it comes to breeding, most New World monkeys have only one mate at a time. When the baby monkey is born, both the male and female monkey care of it until it is old enough to take care of itself.

Most New World monkeys have claw-like nails called tegulae, which are only present on a few fingers and toes. They are used to grip tree branches. Old World monkeys, in contrast, have blunt nails called ungulae.

Old World Monkeys

Old World monkeys can be found in Asia and Africa. Some of them are arboreal, living mostly in trees, while others are terrestrial, spending most of their life on the ground.

Mantled guereza at Arusha National Park, Tanzania by Yoky

Old World monkeys range from medium to large in size, with most being over two feet long. The largest monkey, the mandrill, is an Old World monkey.

Old World monkeys have wider noses with the nostrils located closer to each other and pointing downwards – much like our noses. Old World monkeys have longer tails than apes, but shorter tails than New World monkeys. Their tails are never prehensile.

An Olive baboon at the Ngorongoro Conservation Area in Tanzania by Muhammad Mahdi Karim (www.micro2macro.net)

Male Old World monkeys and some females can have several mates at a time. When the baby is born, the female takes care of it. If it is a daughter, it will stay with her for the rest of her life, but if it is a son, there is a chance that it will leave in order to establish its own territory and start its own troop.

Unlike New World monkeys, Old World monkeys have opposable thumbs. This means that they can move their thumb forward and backward and touch their other fingers with it, just like we can. They also have nails on all of their fingers and toes.

Cheek pouches are another trait Old World monkeys have that New World monkeys do not. They can make their cheeks larger, like hamsters, in order to store food for them to eat later.

Some Old World monkeys have distinct ischial callosities. This means that they have a hairless rump which is covered with small bumps. This is particularly prominent in the baboon, and has been making children point and laugh for hundreds of years!

Baboon buttocks by prakhar


Baboons are the most terrestrial monkeys, which means, they spend more time on the ground than any other monkey. They are able to climb trees, though, especially when they can’t outrun an enemy.

Baboons are some of the largest monkeys. Because of their size, baboons will prey on smaller animals, even smaller monkeys. They are even willing to fight leopards if a leopard threatens their young.

Baboon and its mother on a rock, photographed at Lake Manayara National Park, Tanzania by Charles J Sharp

Infanticide – the killing of the young – is common among baboons, particularly among chacma baboons. Interestingly, though, chacma baboons are also more open to adopting orphaned young.

Hamadryas baboons, which are found in North Africa, were sacred to the ancient Egyptians. They were associated with the god Thoth, who helped maintain the order of the universe, sorted out quarrels between other gods, and judged the dead.

Male baboon says Phhhbt by VasuVR

Male Hamadryas baboons can be easily distinguished from the females, not just because they are twice as large, but because they have silvery white fur, as well as a mane and a mantle. Females are light brown, while infants are a dark shade of brown, only becoming lighter with age.

Bald uakari

The bald uakari gets its name from its hairless head and face – a contrast to the rest of its body, which is covered in thick white, brown, or reddish fur. Its face appears scarlet red, as a result of the lack of skin pigment and the abundance of blood vessels just below the skin.

Bald uakari by Marc Wisniak

The bald uakari’s red face is actually an indication of its health. The redder the face – the healthier the monkey. This plays an important role when it comes to mating, since females only mate with healthy males who, in turn, can give them healthy offspring.

Bald uakari in Brazil by Aaron Martin

Bald uakaris have a powerful lower jaw, which allows them to open nuts and unripe fruits with their mouths. It is no wonder, then, that their diet consists mostly of seeds, nuts, and fruits.

Barbary macaque

The Barbary macaque is the only monkey that can be found in Europe, and the only macaque that can be found outside Asia. Over two hundred of them can be found on the island of Gibraltar, near Spain, where they are a popular attraction.

Father macaque and baby macaque in Gibraltar by Karyn Sig

Male Barbary macaques are known for the outstanding care they give to their young. Whereas other male monkeys spend only a little time caring for their young, or none at all, male Barbary macaques spend a lot of time grooming their young and watching over them.

Capuchin monkey

Capuchin monkeys get their name from the patch of hair on their heads that resembles the hood Capuchin monks wore. They are considered one of the most intelligent New World monkeys, since they have been observed to use tools frequently.

White-faced capuchin monkeys examining a poor grasshopper by Carlos Luna

For example, white-fronted capuchin monkeys make cups out of leaves in order to drink water from holes in trees. White-headed capuchins rub the juices of certain plants on themselves to get rid of pests and use sticks as weapons against snakes. Tufted capuchins have also been seen using stones to crack nuts.

Cotton-top tamarin

The cotton-top tamarin is one of the smallest monkeys, weighing only about a pound, and never growing much more than ten inches or about the length of a woman’s foot.

Cotton top tamarin by cuatrok77

The cotton-top tamarin is named for its white crest. It also has fine white hairs on its face, but these are so fine that they are difficult to see, making the cotton-top tamarin’s face look hairless. It is different from other New World monkeys in that it has only four molars – the grinding teeth at the back of the mouth – instead of six.

Cotton-top tamarins also have a unique social structure. Like other monkeys, they live in groups, but their groups are led by a dominant male and female. The dominant pair are the only ones allowed to breed. The female gives birth to about four infants a year and they are cared for by the rest of the group.

Cotton top tamarin by T-34-85

Currently, the cotton-top monkey is listed as a Critically Endangered species and in fact, is numbered among the world’s 25 most endangered primates, with only about 6,000 remaining in the wild.

Crab-eating macaque

Crab-eating macaques are so named because in Indonesia they are often seen diving into the water in search of crabs. They do not eat just crabs, though, but eat just about anything from fruits and seeds to birds, small mammals, and insects.

Crab-eating macaque family by Taro Taylor

In Thailand, crab-eating macaques have been observed to use tools. They use stones to open nuts and oysters, and wash fruits before eating them.

Crab-eating macaque at Upper Pierce Reservoir, Singapore by Brian Jeffery Beggerly

Like rhesus monkeys, crab-eating macaques are also extensively used in medical experiments, and have been used as space test flight animals. This is because they share many physical similarities with humans and so can be afflicted with the same infections.

Douc monkey

Douc monkeys are monkeys native to Southeast Asia. They are known for having legs that are a different color from the rest of their bodies. Red-shanked doucs, for example, have bright maroon legs.

A red-shanked douc in Singapore Zoo by Bjørn Christian Tørrissen

The gray-shanked douc monkey is one of the most endangered monkeys in the world, and can be found only in Vietnam. It has a population of less than 700 animals.

Gee’s golden langur

Gee’s golden langur is a monkey found in India which has long been considered sacred by the people of the Himalayas. Adult males have beautiful golden fur, while females and juveniles have silvery white fur.

Golden langur in Assam, India by Yathin S Krishnappa

Gee’s golden langur takes its name from its vibrant fur and the explorer, E.P. Gee. Gee was a British tea planter living in India who, after hearing reports of an unusually colored primate in the area of Assam, organized an expedition to find the animal and observe it. Three years later, Gee’s golden langur was announced as a new species.

Golden lion tamarin

The golden lion tamarin or golden marmoset also gets its name from its bright golden fur. Scientists believe its color may come from sunlight reacting with the plants it eats.

Golden lion tamarin pointing the way at Apenheul, the Netherlands by jinterwas

At night, golden lion tamarins sleep together in groups in trees, preferring those that are 11 to 15 meters off the ground. They are known to use the same sleeping site over and over, which unfortunately, makes them easy to find for predators such as birds of prey, snakes, pumas and jaguars.


Geladas, or gelada baboons, eat mostly grass. They have small fingers that are built for pulling grass out, and small, narrow teeth made for chewing it.

Geladas have an hourglass-shaped patch on their chests, which is a brighter shade of red in males. When a female is ready to breed, her patch becomes covered in blisters, making it more noticeable and an invitation to the males of the group.

Gelada by Kolumbusjogger

Adult geladas are covered in dark brown hair, but infants are completely black. At birth, a gelada infant weighs less than 500 grams. Its mother keeps it close for the first few weeks to keep it safe, both from predators and from other females in the group who might kidnap it!

Howler monkey

Howler monkeys are the loudest land animals, their deep howls can be heard up to three miles away. These howls are usually made at dawn and dusk to warn other animals to stay out of their territory.

Of all the New World monkeys, howler monkeys are the only exclusive folivores, which means they eat only leaves. They are careful not to eat too many of the same kind of leaf in one sitting, though, to avoid getting poisoned.

Brown howler monkey, São Paulo, Brazil by Dario Sanches

Howler monkeys have a very keen sense of smell. In fact, they can smell food from over a mile away.

The Mayans had a pair of howler monkey gods that were revered as gods of the arts. Statues of them have been found in Copan, a Mayan archaeological site in Honduras.

Howler monkeys doing their thing by Steve

Apart from howling, mantled howler monkeys use certain gestures to communicate. For example, females smack their lips or stick out their tongues to let males know they are ready to breed, while the young ones shake branches to show that they want to play.

Black howler monkeys are quite lazy, resting or sleeping for more than sixteen hours each day. They stay in trees and hardly come down, even to drink, since they get their water from the leaves they eat. During rainy season, they rub their hands with the wet leaves and then lick the water off their hands.

Japanese macaque

Japanese macaques are native to Japan and are sometimes called snow monkeys. They are often found in Japan’s colder areas, with their thick fur meaning they are well-adapted to temperatures that can dip to twenty degrees Celsius below zero.

Japanese macaque in hot springs near Nagano, Japan by Yblieb

Female Japanese macaques spend more time in the trees, while the males spend more time on the ground. They are good leapers and are also good swimmers, able to swim up to half a kilometer.

Snow monkeys at the Jigokudani Monkey Park near Nagano, Japan by PMS2718

Japanese macaques have been observed to be very intelligent–washing their food before eating, and even dipping it into salty sea water for seasoning. They are also very playful, bathing in hot springs, and even rolling snowballs to throw during winter.


Mandrills are among the largest monkeys. The males weigh about thirty-two kg (seventy pounds) on average and can grow up to nearly a meter in length which is about the height of a four year old human.

Colorful mandrill by Robert Young

More than their size, mandrills are known for their color. Their muzzles are red and blue, their beard yellow, and their bellies white, while their rumps are scarlet, pink, blue, and purple.

Human-looking mandrill by Malene Thyssen

Unlike other monkeys, mandrills mean no harm when they bare their teeth. When they are angry, they stare, bob their heads, and beat the ground while making grunting sounds.

Proboscis monkey

The proboscis monkey is known for its unusually large nose, with males having even larger ones than females, so large in fact, that they droop past their mouths. The word ‘proboscis’ literally means ‘nose’.

Proboscis monkey, Singapore by chem7

Proboscis monkeys are also called monyet belanda or orang belanda by the locals, which means, ”Dutch monkey” and ”Dutchman” respectively. The locals thought the monkeys looked like the Dutch colonizers of Indonesia who were considered to have large noses and big bellies!

Proboscis monkeys live in groups, which can come together to form bands – communicating through various sounds. Male proboscis monkeys make particularly loud noises, all aided of course by their large noses. They honk to announce the status of their group, and also give a special soothing honk to reassure the infants.

Proboscis monkeys, Java by belgianchocolate

Proboscis monkeys like to stay near the water and spend a lot of time swimming, which is probably why they have developed webbed feet. They are often seen jumping off tree branches into the river, and they can swim underwater, too.

Pygmy marmoset

The pygmy marmoset is the smallest monkey in the world, measuring a maximum of six inches in length and weighing only 100 grams. It is native to the Amazon rainforests.

Pygmy marmosets spend most of their time up in the trees to avoid predators. To help with this task, they can rotate their head up to 180 degrees while perched on a tree branch.

Pygmy marmoset, Sacha Lodge, Ecuador by Don Faulkner

Pygmy marmosets have teeth and stomachs specially made for chewing tree gum, which makes up the bulk of their diet.

Pygmy marmosets usually give birth to twins. Unlike most monkeys, the male monkey is the one who carries the infants on his back, not the female.

Rhesus macaque

The rhesus macaque or rhesus monkey is one of the best-known monkey species. This is mainly because they are commonly used in scientific experiments, particularly in the fields of medicine and space exploration.

Rhesus macaque, Red Fort, Agra, India by Yann

In a group of female rhesus macaques, the rank of a daughter depends on her mother’s rank. Strangely, the younger females have a higher rank than the older ones, probably because they are fitter and better able to reproduce.

Spider monkey

Spider monkeys do not have eight legs. Rather, they get their name from the fact that their arms and legs are very long, making their bodies look small in comparison. They also have long tails that can grow up to three feet long.

Spider monkeys do not have any thumbs. They are, however, very well suited to life in the trees. They have hook-like fingers, with which they grip tree branches, and their prehensile tails can support their entire weight.

Black-headed spider monkey by Petruss

Spider monkeys live in groups of fifteen to twenty-five individuals. During the day, however, they split into smaller groups to find food.

While most female monkeys give birth once or twice a year, female spider monkeys only give birth once every three or four years. This slow reproduction rate is one of the reasons why the species is currently endangered.

Spider monkey casually hanging out on a boat in Belize by Jdlrobson

The brown spider monkey and brown-headed spider monkey, which is a subspecies of the black-headed spider monkey, are both included in the list of The World’s 25 Most Endangered Primates. They are threatened by hunting for bush meat, and because of habitat loss.

Squirrel monkey

Squirrel monkeys are small monkeys ranging from twenty-five cm (nine inches) to thirty-five cm (fourteen inches) long. They have mostly olive fur, but have yellowish orange arms and legs with gray or black and white faces.

Squirrel monkey by Vaughan Leiberum

Because some have black and white faces, squirrel monkeys have been given the alternative name Totenkopf monkeys, or death head monkeys! In German, Totenkopf refers to the symbol of the skull and crossbones.

The common squirrel monkey is one of the most commonly kept pet monkeys in the world. It is popular because of its size, curious nature, and the fact that it is not as noisy as some other monkeys. It is also easy to care for, although it needs a lot of space to move around in.

Vervet monkey

Vervet monkeys are well known for their complex alarm calls. They can give a distinct call for each of their main predators, and mothers can also recognize their offspring’s alarm call even from a distance. They can even tell exactly where the call is coming from.

Vervet monkey photo taken in Dar es Salaam, Tanzania by Alexander Landfair

Vervet monkeys on the island of St. Kitts are known for their love of alcohol, with about five percent of them being heavy drinkers – drinking until they pass out! They are often seen raiding the beach in search of alcoholic beverages.

Other Monkey Species

Black-and-white colobus monkeys have no thumbs. They are mostly black with patches of white, though newborns are completely white.

The Celebes crested macaque is the only monkey found on the island of Sulawesi, in Indonesia. Its name comes from its crest, which looks like a Mohawk. It is also known for its pink rump, a stark contrast to the rest of its body which is covered in jet-black fur.

Self-portrait of a female Celebes crested macaque in Indonesia – David Slater

The De Brazza’s monkey can be found in central Africa, where it is called the swamp monkey. It has a distinct white beard and an orange marking on its forehead.

The Diana monkey gets its name from the crescent-shaped marking on its forehead, which is said to resemble the bow of the Roman goddess Diana. It is a noisy monkey, especially when warning others of predators like the common chimpanzee.

Drills are monkeys that can only be found in parts of Africa. The males are identified by their pink chins while the two subspecies, the mainland drill and the Bioko drill, can be distinguished by their crowns. Mainland drills have yellow and black rings on their crowns, and Bioko drills have black-tipped crowns.

Golden snub-nosed monkeys, Qinling Mountains, China by Giovanni Mari

Golden snub-nosed monkeys are the most widely distributed snub-nosed monkeys in China. Adult males have long golden hair, while the females are dark brown and juveniles are light brown. Infants are born with gray hair, which turns brown after two months.

The lion-tailed macaque is also called the beard ape. It is not an ape, but it does have a thickly bearded face. It gets its name from its tail, which can grow more than two feet long and has a black tuft at the end, just like a lion’s.

Lion-tailed macaque by N.A. Naseer (www.nilgirimarten.com)

Panamanian night monkeys are the only truly nocturnal monkeys and are found in Central and South America. They have big brown eyes, but hardly have any visible ears. They live in trees where they hunt insects for food.

Saki monkeys, which are found in Central America, have a unique appearance with their hairless faces surrounded by a hood of thick fur. They are completely arboreal, and use their strong hind legs to jump from one tree to another.

Saki by Belgianchocolate

The silvery lutung has a special stomach with three chambers, and an intestine that is longer than most monkeys. This allows it to digest the leaves it eats, which comprises up to 91% of its diet.

Titi monkeys are different from most other monkeys because they mate for life. The female gives birth to one or two offspring a year. The male does most of the childcare, with the female only carrying the infant when nursing.

Monkeys and Humans

Between 100,000 and 200,000 non-human primates are used as research subjects worldwide each year.

On June 11, 1948, the first monkey was sent into space. He was a rhesus monkey named Albert. Sadly, he did not survive the flight due to technical failures.

The first monkeys to return to Earth after traveling in space were Able, a rhesus monkey, and Miss Baker, a squirrel monkey. They returned to Earth on May 28, 1959 aboard the Jupiter AM-18.

Squirrel monkey Miss Baker poses with Certificate of Merit for Distinguished Service by NASA

Some capuchin monkeys have been trained to become service animals. They can provide personal care to the disabled, particularly those with spinal cord injuries, or who can no longer move their arms and legs.

Many monkeys are kept as pets all over the world. The most commonly kept pet monkeys are capuchin monkeys, macaques, marmosets, spider monkeys, and squirrel monkeys.

In Hinduism, there is a monkey god named Hanuman who is featured in many tales, including the epic Ramayana. He is devoted to serving the god Rama and gives courage and strength to others who are devoted to him.

The sanzaru are three wise monkeys from Japanese folklore. One of them, Mizaru, has his eyes covered so he can see no evil. Another, Kikazaru, has his ears covered so he can hear no evil, and the third, Iwazaru, covers his mouth so he can speak no evil.

‘Three Wise Monkeys’ by Simon James

Monkeys may seem friendly, but have been known to attack humans, both in captivity and in the wild. In 2009, there was a report of a monkey killing a human by deliberately throwing a coconut at his head, and in 2010, there was another report of a monkey dropping a human infant from a roof.

Final Facts

It is unclear where the word ‘monkey’ came from. Some believe, however, that it came from Moneke, the name of a character in an old German fable who was the son of an ape. Others think the word ‘monkey’ comes from ‘manneken’, which is Dutch for ‘little man’.

When most monkeys grin or yawn, this does not mean that they are happy or sleepy. Rather, it means that they are angry and getting ready to attack!

Monkeys don’t actually eat banana peels, nor is their favorite fruit the banana. In fact, they are rarely seen eating bananas. When they do eat bananas, they peel it from the other side that we do.

Some monkeys go down to the ground in order to eat dirt. This allows them to get some precious minerals, like sodium, and also to prevent diarrhea.

The oldest known monkey was a black spider monkey named Buenos who lived to be fifty-two years old before dying of a heart ailment.

“Sorry to see you go” National Zoo by angela n







Vervet monkey

Barbary macaque

Celebes crested macaque

Rhesus macaque

Japanese macaque


Proboscis monkey

Gee’s golden langur

Golden snub-nosed monkey

Pygmy marmoset

Golden lion tamarin

Capuchin monkeys

Cotton-top tamarins

Howler monkeys

Bald Ukari

Photo Credits

Front Cover

Two baby capuchins by Eric Isselée www.thinkstockphotos.co.uk/image/stock-photo-two-baby-capuchins-sapajou-apelle/116125816

Monkey near the Nahargarh Fort by Kevin Jones www.flickr.com/photos/kj-an/3073979720/ cc2.0 creativecommons.org/licenses/by/2.0/deed.en_GB

Monkey Family by Nathan_Clement www.flickr.com/photos/nathancclement/9482904249/ cc2.0

Cleaning monkeys by Ross Hawkes www.flickr.com/photos/rosshawkes/5624946349/ cc2.0

Capuchin Monkeys by Vytautas Šėrys www.flickr.com/photos/vserys/6867718774/ cc2.0

White fronted capuchin monkey by Geoff Gallice www.flickr.com/photos/[email protected]/5677050925 cc2.0

Mantled Guereza at Arusha National Park, Tanzania by Yoky cc3.0

An Olive baboon in the Ngorongoro Conservation Area in Tanzania by Muhammad Mahdi Karim (www.micro2macro.net)

cc1.2 en.wikipedia.org/wiki/GNU_Free_Documentation_License

Baboon buttocks by prakhar en.wikipedia.org/wiki/File:Baboon_buttocks.jpg cc2.0

Baboon and its mother on a rock, photographed at Lake Manayara National Park, Tanzania by Charles J Sharpcc3.0


Hamadryas baboon at the Mysore Zoo, Karnataka, India by VasuVR cc3.0

Bald uakari by Marc Wisniak www.flickr.com/photos/[email protected]/8469172161 cc2.0

Bald uakari in Brazil by Aaron Martin flickr.com/photos/[email protected]/4729677945 cc2.0

Father monkey and baby monkey in Gibraltar by Karyn Sig cc2.0

White-faced capuchin monkeys examining a poor grasshopper by Carlos Luna www.flickr.com/photos/carlosluna/3976804022/ cc2.0

Cotton Top Tamarin by cuatrok77 www.flickr.com/photos/cuatrok77/10545454905/ cc2.0

Cotton Top Tamarin by T-34-85 cc1.0

Crab-eating macaques family affair by Taro Taylor www.flickr.com/photos/tjt195/2421966475/ cc2.0

Crab-eating macaques at Upper Pierce Reservoir, Singapore by Brian Jeffery Beggerly www.flickr.com/photos/beggs/4337648430/ cc2.0

A red-shanked douc in Singapore Zoo by Bjørn Christian Tørrissen cc3.0

Golden langur in Assam, India by Yathin S Krishnappa cc3.0

Golden lion tamarin at Apenheul, the Netherlands by jinterwas www.flickr.com/photos/jinterwas/5644740254/ cc2.0

Gelada-Pavian Hochland (Semiengebirge) by Kolumbusjogger GFDL

Brown Howler Monkey at São Paulo Brazil by Dario Sanches www.flickr.com/photos/[email protected]/2864736732 cc2.0

Howler monkeys doing their thing by Steve cc2.0

Japanese Macaque in hot springs near Nagano, Japan by Yblieb cc3.0

Snow monkeys at the Jigokudani Monkey Park near Nagano Japan by PMS2718 cc3.0

Mandrill by Robert Young www.flickr.com/photos/[email protected]/2954211599 cc2.0

Human-looking Mandrill by Malene Thyssen cc3.0

Proboscis Monkey, Singapore by chem7 www.flickr.com/photos/[email protected]/3048152122/ cc2.0

Proboscis Monkey, Java by belgianchocolate www.flickr.com/photos/frank-wouters/10100165/ cc2.0

Pygmy Marmoset, Sacha Lodge, Ecuador by Don Faulkner www.flickr.com/photos/[email protected]/5336772236 cc2.0

Rhesus Macaque, Red Fort, Agra, India by Yann cc3.0

Black-headed spider monkey by Petruss cc3.0

Spider monkey hanging out on a boat in Belize by Jdlrobson cc3.0

Squirrel Monkey by Vaughan Leiberum www.flickr.com/photos/laertes_za/3055795154/ cc2.0

Vervet monkey photo taken in Dar es Salaam, Tanzania by Alexander Landfair cc1.0

Self-portrait of a female Celebes crested macaque (Macaca nigra) in North Sulawesi, Indonesia – David Slater cc1.0

Golden Snub-nosed Monkeys, Qinling Mountains, China by Giovanni Mari www.flickr.com/photos/giovannimari/7297165536/ cc2.0

Lion-tailed macaque by N.A. Naseer (www.nilgirimarten.com) cc2.5 creativecommons.org/licenses/by-sa/2.5/in/deed.en

Saki by belgianchocolate www.flickr.com/photos/frank-wouters/368140791/in/photostream cc2.0

Squirrel Monkey Miss Baker poses with Certificate of Merit for Distinguished Service by NASA

Three Wise Monkeys by Simon James www.flickr.com/photos/[email protected]/4376859324 cc2.0

National Zoo by angela n. www.flickr.com/photos/aon/8547060406/ cc2.0