Gray Monkeys

Allen’s Swamp Monkey

Species Name: Allenopithecus nigroviridis

Allen's swamp monkeys are small, stocky monkeys with gray to brown fur and long tails. These highly social primates live in the swamp forests of central Africa, where they mostly spend their time in the trees. It was named after Joel Asaph Allen, an American zoologist.

Alta Floresta Titi

Species Name: Plecturocebus grovesi

The Alta Floresta titi is a distinct but unnamed form of titi (Plecturocebus) rediscovered in 2019 in Chapada dos Parecis, a plateau in the far south of the Brazilian state of Rondônia. This species lives exclusively between the Teles-Pires and Juruena rivers in Mato Grosso.

Andean Night Monkey

Species Name: Aotus miconax

Andean night monkeys are a genus Aotus, commonly known as nocturnal monkeys or the Peruvian night monkey. Species in this genus are the only truly nocturnal monkeys in the world. Andean night monkeys are not sexually dimorphic as males and females look very similar.

Angolan Talapoin

Species Name: Miopithecus talapoin

Also known as the Southern talapoin, Angolan talapoin is a primate species in the Cercopithecidae family. Tail color varies from grayish-black to brownish-black above and is yellow or yellowish-gray below. The Angolan talapoin monkeys are among the smallest species of Old-World monkeys.

Annamese Silvered Langur

Species Name: Trachypithecus margarita

The Annamese langur is another Old-World monkey in the subfamily Colobinae. Annamese langurs are covered in thick, gray fur. They have dark faces, and the space around the eyes is pale and forms a ring, often in the flesh. Trachypithecus margarita is a monotypic species as it has no subspecies.

Ashy Black Titi

Species Name: Plecturocebus cinerascens

The Ashy black titi is a species initially described in 1823 as Callicebus cinerascens. Ashy black titi monkeys live in small families comprising a monogamous pair and their young. Adult males tend to carry their infants unless the mother is nursing.

Ashy Red Colobus

Species Name: Piliocolobus tephrosceles

The Ashy-red Colobus or Ugandan red Colobus is an endangered species of red Colobus endemic to Eastern Africa. Like other colobus monkeys, Ashy Red has small thumbs that allow it to comfortably grip branches and swing nimbly through the canopy. In 2001, the ashy-red Colobus was recognized as a separate species.

Azara’s Night Monkey

Species Name: Aotus azarae

Azara's night monkeys, also known as southern night monkeys and Azara's owl monkeys, are native to the Gran Chaco region of South America, a vast area with many different ecosystems, from savannas to grasslands to dry spiny forests and gallery forests. Genetic testing has shown that the males of this species mated pairs are the fathers of the babies they care for.

Bare-eared Squirrel Monkey

Species Name: Saimiri ustus

The bare-eared squirrel monkey also called the golden-backed squirrel monkey, is a subspecies of the Saimiri sciureus group native to the tropical forests and jungles of South and Central America. The bare-eared squirrel monkey differs from other species because it does not have ear tufts.

Bengal Sacred Langur

Species Name: Semnopithecus entellus

The Bengal sacred langur, also known as Hanuman's langur and the northern plains gray langur, is a primate species in the Cercopithecidae family. The Bengal sacred langurs are often referred to as "Hanuman's langurs", named after Lord Hanuman - the Hindu god.

Black Squirrel Monkey

Species Name: Saimiri vanzolinii

The black squirrel monkey, also called the black-headed squirrel monkey or the blackish squirrel monkey is a small New-World monkey native to the central Amazonian region of Brazil. The black squirrel monkey closely resembles the much more common Bolivian squirrel monkey. However, the latter lacks the central black back.

Black Sumatran Langur

Species Name: Presbytis sumatrana

The black Sumatran langur is a species of monkey in the Cercopithecidae family that is endemic to Indonesia's Sumatra Island. Presbytis sumatrana was once considered a subspecies of Sumatran Surili. Still, genetic analysis has shown it to be a distinct species.

Black-capped Squirrel Monkey

Species Name: Saimiri boliviensis

The black-capped squirrel monkey is a New-World primate species endemic to the upper Amazon basin in Bolivia, eastern Peru, and western Brazil. Primarily, black-capped squirrel monkeys are arboreal and found in native and plantation forests and some managed areas close to running water.

Black-Crested Sumatran Langur

Species Name: Presbytis melalophos

The black-crested Sumatran langur (Presbytis melalophos), also called the Mitred leaf monkey, is a primate species in the Cercopithecidae family. The black-crested Sumatran langur, Raffles' banded langur, Sarawak surili, and black-and-white langur were formerly considered subspecies of Presbytis melalophos.

Black-footed Gray Langur

Species Name: Semnopithecus hypoleucos

The black-footed gray langur is an Old-World monkey, one of the langur species. Like other gray langurs, this species is a leaf-eating monkey in southern India. The black-footed gray langur is distributed throughout southwestern India (Kerala, Karnataka, and Goa) but is concentrated in the Western Ghats.

Black-fronted Titi

Species Name: Callicebus nigrifrons

The black-fronted titi is a New-World monkey native to Brazil. Black-fronted titi monkeys have short faces, fluffy bodies, long legs, and long fluffy tails. The black-fronted titi monkey is listed as Near Threatened by the IUCN due to extensive habitat loss and fragmentation in the remnant Atlantic Forest in southeastern Brazil.

Black-headed Marmoset

Species Name: Mico nigriceps

The black-headed marmoset is a species of marmoset native to Brazil. It inhabits tropical rainforests, mainly second growth and fringes. Black-headed marmoset lives in large family groups of 4 to 15 individuals. Typically, only one female per group breeds during any given breeding season.

Black-shanked Douc Langur

Species Name: Pygathrix nigripes

One of three species of Douc langur (the gray-footed and the red-footed are the other two), the black-shanked douc langur is only found in southwestern Vietnam and eastern Cambodia, inhabiting primary monsoon forests as well as secondary and tropical forests.

Black-Tufted Marmoset

Species Name: Callithrix penicillata

The black-tufted marmoset, also called the Black-pencilled marmosets or Mico-estrela in Portuguese is a type of New-World monkey. They live mainly in the neotropical gallery forests of the central Brazilian plateau.

Blue Monkey

Species Name: Cercopithecus mitis

The blue monkey is a species of Old-World monkey endemic to east and central Africa, ranging from the upper Congo Basin east to the East African Rift Valley and south to Zambia and northern Angola.

Bonnet Macaque

Species Name: Macaca radiata

The Bonnet Macaque, also called Zati, is a species of macaque native to southern India. Bonnet macaques get their common name from a unique feature: a hood-like tuft of hair that extends from the top of their head, much like a tuft of dry grass. Their marble-round eyes look out into the world with a very expressive forehead.

Brumback’s Night Monkey

Species Name: Aotus brumbacki

Brumback's Night Monkey is a nocturnal monkey species found in Colombia. Still, recently, it has been argued that it should be considered a separate species. The species is named in honor of the American naturalist and physician Roger Brumback.

Buffy-headed Marmoset

Species Name: Callithrix flaviceps

The buffy-headed marmoset is a rare species of marmoset native to the tropical rainforests of southeastern Brazil. These miniature and shy monkeys are mostly tree dwellers, crawling on 4 legs (quadrupeds) from tree to tree with jerky, squirrel-like movements.

Buffy-tufted Marmoset

Species Name: Callithrix aurita

The buffy-tufted marmoset, also called the white-eared marmoset or buffy-tufted-ear marmoset is a New World monkey living in the forests of the Atlantic coast of southeastern Brazil. Unlike most marmoset monkeys, buffy-tufted-ear marmosets are mainly insectivorous, although their diet is generally carnivorous.

Capped Langur

Species Name: Trachypithecus pileatus

The capped langur is a type of monkey in the Cercopithecidae family. These langurs can vary in appearance. This Asian primate gets its name from the thick hairs on the top of the head, typically gray or black.

Cazuza’s Saki

Species Name: Pithecia cazuzai

Cazuza's Saki is native to northwestern Brazil. Populations of this species were previously classified as Rio Tapajós saki (Pithecia irrorata). Still, a 2014 study found that these populations had a pelage distinct from all other species in the genus and were therefore considered their own species, Pithecia cazuzai.

Chacma Baboon

Species Name: Papio ursinus

Like all other baboons, the Chacma baboon, the Cape baboon, belongs to the Old-World monkey family. Chacma baboons have a habit of flipping over rocks in search of food. So, it's pretty easy to spot where a group of Chacmas once foraged.

Coastal Black-handed Titi

Species Name: Callicebus melanochir

The coastal black-handed titi is another species of titi, a New World primate native to the Atlantic Forest of northeastern Brazil. Coastal black-handed Titi monkeys vocalize synchronously early in the morning, possibly to announce their presence in their territory.

Coimbra Filho’s Titi

Species Name: Callicebus coimbrai

or Coimbra titi is a species of titi, a New World primate native to the forests of the Brazilian states of Sergipe and Bahia. It is named in honor of Adelmar F. Coimbra-Filho, founder and former director of the Rio de Janeiro Primate Center, for his Brazilian biology and primatology work.

Collared Mangabey

Species Name: Cercocebus torquatus

The collared mangabey, also called the white-collared mangabey or red-capped mangabey, is an Old-World monkey endemic to the Atlantic coast of central and west Africa. Its distinctive chestnut-red cap gives the species the name red-capped mangabey, and its white collar gives it the names white-collared and collared mangabey.

Collins’ Squirrel Monkey

Species Name: Saimiri collinsi

Collins' Squirrel Monkey is a species of squirrel monkey endemic to Brazil. Until a genetic study by Jessica Lynch Alfaro et al. raised them to the species category, Collins' squirrel monkey had been considered a subspecies of the squirrel monkey (Saimiri sciureus).

Crab-Eating Macaque

Species Name: Macaca fascicularis

The crab-eating macaque also called the long-tailed macaque and known in laboratories as the cynomolgus monkey, is a primate monkey endemic to Southeast Asia. Crab-eating macaque macaques live in multi-male groups comprising around 30 members.

Cross Marked Langur

Species Name: Presbytis chrysomelas

The Sarawak surili, also known as Cross-marked Langur, is a monkey species in the Cercopithecidae family. The Sarawak surili was once considered widespread but has declined significantly due to habitat and loss persecution.

De Brazza’s Monkey

Species Name: Cercopithecus neglectus

De Brazza's monkey is an Old-World primate native to central Africa's swamp and riverine forests. It is the largest species of the guenon family and one of the most widespread African arboreal primates.

Dent’s Mona Monkey

Species Name: Cercopithecus denti

The expressive face of Dent's mona monkey is characterized by golden eyes; a flat, long, dark nose; and a pink chin and mouth. Dent mona monkeys are often found in the company of other primate species.

Diana Monkey

Species Name: Cercopithecus diana

The Diana monkey is an Old-World primate found in the high-canopy forests of Liberia, Sierra Leone, and the western Ivory Coast. Diana monkeys get their name from the white crescent-shaped headband that resembles the crescent moon on the forehead of the Roman goddess Diana, protector of woodlands and wildlife.

Drill

Species Name: Mandrillus leucophaeus

The Drill is a primate in the Cercopithecidae family (Old-World monkeys), related to baboons and even more closely to mandrills. Like mandrills, drills are highly social animals that live in groups of around 20 individuals with multiple males and females, with one male dominating reproductive decisions.

Dryas Monkey

Species Name: Chlorocebus dryas

The Dryas monkey, also called the Salonga monkey, Inoko, or Ekele is a little-known Old World primate only found in the Congo Basin and restricted to the Congo River's left bank. Unlike guenon monkeys, which make loud leaps and resounding calls, dryas monkeys move silently.

Dusky Langur

Species Name: Trachypithecus obscurus

Dusky langurs also known as spectacled langurs, spectacled leaf monkeys, and dusky leaf monkeys, are primarily found in the Malay Peninsula in Asia. White rings surrounding the deep, dark eyes give the species its alternative name, the spectacled monkey or spectacled langur, for a "bespectacled" look.

Ecuadorian Squirrel Monkey

Species Name: Saimiri macrodon

The Ecuadorian squirrel monkey is a species of the squirrel monkey. Although it occasionally ventures to the ground to play or feed, the Ecuadorian squirrel monkey is strictly an arboreal primate.

Emilia’s Marmoset

Species Name: Mico emiliae

The Emilia's marmoset also called the Snethlage's marmoset, is a marmoset native to Brazil. The species is named after Emilie Snethlage, a German-born Brazilian ornithologist.

Emperor Tamarin

Species Name: Saguinus imperator

The Emperor Tamarin is a species of tamarin named for its resemblance to the German Kaiser Wilhelm II. It lives in the states of Acre and Amazonas, western Brazil, and the southwestern Amazon basin.

Formosan Rock Macaque

Species Name: Macaca cyclopis

The Formosan rock macaque also called the Taiwanese macaque, or Formosan rock monkey, is a macaque native to the island of Taiwan. Aside from humans, Formosan rock macaques are the only native primates living in Taiwan.

Gabon Talapoin

Species Name: Miopithecus ogouensis

The Gabon talapoin, also called the northern talapoin, is a small species of African primate endemic to riverine habitats in Gabon, Equatorial Guinea, Cameroon, the far western Democratic Republic of the Congo, and the western Republic of the Congo.

Golden-Bellied Mangabey

Species Name: Cercocebus chrysogaster

The golden-bellied mangabey (Cercocebus chrysogaster) is a gregarious Old-World monkey found in humid, swampy forests south of the Congo River. Golden-bellied mangabeys are a migratory and social species, moving in groups of 8 to 30 members.

Gray Snub-Nosed Monkey

Species Name: Rhinopithecus brelichi

The gray snub-nosed monkey (Rhinopithecus brelichi), also called Guizhou golden monkey, Brelich's snub-nosed monkey, and Guizhou snub-nosed monkey is a species of primate in the Cercopithecidae family. The confirmed range of the gray snub-nosed monkey is endemic to China (Fanjingshan National Nature Reserve in Wuling Mountains of Guizhou Province).

Gray-bellied Night Monkey

Species Name: Aotus lemurinus

The gray-bellied night monkey (Aotus lemurinus) is a rare nocturnal primate found in the cloud forests of Colombia and Ecuador. Recognizable by its red eyes, gray underbelly, and woolly coat, it thrives in dense canopies where it feeds on fruits, insects, and nectar. Its nocturnal habits reduce competition and help it evade predators like owls and snakes. As both seed disperser and prey, it plays a key ecological role—yet habitat loss continues to threaten its survival.

Gray-Cheeked Mangabey

Species Name: Lophocebus albigena

The gray-cheeked mangabey (Lophocebus albigena), also called the white-cheeked mangabey, is an Old World monkey found in the forests of central Africa. Gray-cheeked mangabeys belong to the same family (Cercopithecinae) and phylum (Papionini) as mandrills, macaques, and baboons.

Gray-handed Night Monkey

Species Name: Aotus griseimembra

The gray-handed night monkey (Aotus griseimembra) is a small, nocturnal primate native to Colombia, Venezuela, and Panama. Known for its large owl-like eyes and gray limbs, this tree-dwelling monkey thrives in rainforest canopies and plays a vital role as a seed disperser. Monogamous and family-oriented, it relies on both parents—especially the father—for infant care. Though adaptable, habitat loss, hunting, and the pet trade threaten its survival, earning it a Vulnerable status on the IUCN Red List. Conservation efforts are crucial to preserve this unique night-dweller and its forest ecosystem.

Gray-Shanked Douc Langur

Species Name: Pygathrix cinerea

The gray-shanked douc langur (Pygathrix cinerea) is a species of douc endemic to the Vietnamese provinces of Gia Lai, Quảng Ngãi, Kon Tum, Bình Định, and Quảng Nam. Genetically, Gray-shanked douc langurs are similar to Red-shanked douc langurs (Pygathrix nemaeus).

Gray’s Bald-faced Saki

Species Name: Pithecia irrorata

Gray's Bald-faced Saki (Pithecia irrorata), also known as Rio Tapajós saki, is a New World monkey native to South America. These monkeys are renowned for being reclusive because they avoid humans and quiet nature.

Guianan Brown Capuchin

Species Name: Sapajus apella

The tufted capuchin (Sapajus apella), also called the pin monkey, Guianan brown capuchin, or black-headed capuchin is a New World monkey native to South America and the Caribbean islands of Margarita and Trinidad.

Guianan Saki

Species Name: Pithecia pithecia

The white-faced saki (Pithecia pithecia), also known as the golden-faced saki, Guianan saki, and Guyana saki, is a New World saki monkey species. Typically, they have a lifespan of around 14 years in the wild and have lived up to 36 years in captivity.

Guianan Squirrel Monkey

Species Name: Saimiri sciureus

The Guianan squirrel monkey, also called the South American squirrel monkey, is a squirrel monkey found in Guiana, Brazil, and Venezuela. Saimiri sciureus was once thought to belong to the Collins' squirrel monkey and the Humboldt's squirrel monkey. Still, genetic research in 2009 and 2015 showed they were different species.

Hamadryas Baboon

Species Name: Papio hamadryas

The Hamadryas baboon (Papio hamadryas) is a baboon species in the Old World monkey family. The Hamadryas baboon was a sacred animal to the ancient Egyptians. It appeared in various roles in ancient Egyptian religion, hence its alternative common name, "sacred baboon".

Hamlyn’s Monkey

Species Name: Cercopithecus hamlyni

The Hamlyn's monkey (Cercopithecus hamlyni), also called the owl-faced monkey, is an Old World monkey inhabiting the Congo's bamboo and primary rain forests. Hamlyn's monkeys have unique feet and hands in elongated phalanges.

Hoffmann’s Titi

Species Name: Plecturocebus hoffmannsi

Hoffmann's Titi (Plecturocebus hoffmannsi) is a New World primate native to Brazil. It was described as Callicebus hoffmannsi in 1908. These primates have small to medium-sized bodies. Hoffmann's titis are known to live in small, pair-bonded, and territorial groups and are considered monogamous by most biologists.

Hose’s Langur

Species Name: Presbytis hosei

The Hose's langur (Presbytis hosei) is a primate species in the Cercopithecidae family native to the island of Borneo, which includes Brunei, Kalimantan (Indonesia), and eastern Malaysia. The species was first identified in 1985 in Sangkulirang Peninsula and Kutai National Park in East Kalimantan, Indonesia.

Humboldt’s Squirrel Monkey

Species Name: Saimiri cassiquiarensis

Humboldt's squirrel monkey (Saimiri cassiquiarensis) is a species of squirrel monkey found in South America's tropical rainforests, except for the coastal forests of southeastern Brazil.

Humboldt’s Woolly Monkey

Species Name: Lagothrix lagothricha

Humboldt's woolly monkey, common woolly monkey, or brown woolly monkey (Lagothrix lagothricha) is a woolly monkey endemic to South America. Humboldt's woolly monkeys can show subtle mood swings and intentions with various facial expressions.

Japanese Macaque

Species Name: Macaca fuscata

The Japanese macaque (Macaca fuscata), also called the snow monkey, is a terrestrial Old World species of monkeys endemic to Japan. Japanese macaques from southern regions generally weigh less than those in northern regions of higher altitudes, where there is more snow during the winter months.

Javan Surili

Species Name: Presbytis comata

The grizzled surili (Presbytis comata) is a threatened species of Old World monkey native to the western half of Java, Indonesia, a biodiversity hotspot. The grizzled surili engages in 3 to 4 foraging and feeding fights throughout the day.

Kashmir Gray Langur

Species Name: Semnopithecus ajax

The Kashmir gray langur is an Old-World monkey, one of the species of langurs. The Kashmiri gray langur derives its scientific name, Semnopithecus ajax, from a character in the ancient Greek poem - The Iliad - set during the Trojan War.

Lake Baptista Titi

Species Name: Plecturocebus baptista

The Lake Baptista titi, Plecturocebus baptista, is a species of titi, a New World monkey native to Brazil. Lake Baptista Titi was initially described as Callicebus baptista in 1939.

Malbrouck

Species Name: Chlorocebus cynosuros

The Malbrouck (Chlorocebus cynosuros) is an Old-World primate from Africa that belongs to the Chlorocebus genus. The species is sometimes classified as a subspecies of the green monkey (Chlorocebus pygerythrus) or the common grivet (Chlorocebus aethiops).

Marca’s Marmoset

Species Name: Mico marcai

The Marca marmoset (Mico marcai) is a native endemic to the Amazon in the Aripuanã-Manicoré interfluvium of Brazil. Marca marmosets that submit to a dominant individual show this by baring their teeth and laying their ears flat.

Miller’s Langur

Species Name: Presbytis canicrus

Miller's Langur (Presbytis canicrus), also called the Kutai Gray Langur, is the rarest of the four Hosei subspecies, all of which are native to the island of Borneo. One of the world's most endangered primates, Miller's langur, was once considered extinct until it was rediscovered in 2013.

Miller’s Saki

Species Name: Pithecia milleri

Miller's Saki (Pithecia milleri), also called Miller's monk saki, is a species of the saki family, a type of New World monkey. Miller's sakis are diurnal and quadrupedal leapers. They usually move on all fours but can be seen swinging bipedally on large branches before leaping to another tree.

Mitered Langur

Species Name: Presbytis mitrata

The mitered langur has brown or gray fur on its back, darker, while it is even darker on its belly and the arms, legs, and tail. These Indonesian primates live in groups of 1 male with 5 to 17 females.

Nancy Ma’s Night Monkey

Species Name: Aotus nancymaae

Nancy Ma's Night Monkey (Aotus nancymaae) is a species of night monkey from South America. Nancy Ma's night monkeys are social. They form small groups of 2 to 5 individuals, all directly related to each other.

Napo Saki

Species Name: Pithecia napensis

The Napo saki (Pithecia napensis), also called the Napo monk saki, is a species of saki monkey, a type of New World monkey. The species' common name is derived from the Napo River in its locality.

Natuna Island Surili

Species Name: Presbytis natunae

The Natuna Island Surili (Presbytis natunae) is a primate species in the Cercopithecidae family. The species is native to the Indonesian island of Natuna Besar. The species is native to the Indonesian island of Natuna Besar.

Nepal Gray Langur

The Nepal gray langur (Semnopithecus schistaceus) is a gray langur native to the Himalayas of Nepal, extreme southwestern Tibet, northern Pakistan, northern India, Bhutan, and possibly Afghanistan. The Nepal gray langur is both terrestrial and arboreal.

North Sumatran Leaf Monkey

Species Name: Presbytis thomasi

The North Sumatran leaf monkey (Presbytis thomasi), also called Thomas's langur, is a primate species in the Cercopithecidae family. The North Sumatran leaf monkeys spend most of the day in groups resting, moving, or feeding.

Ornate Titi

Species Name: Plecturocebus ornatus

The ornate titi (Plecturocebus ornatus) is a species of titi and the smallest member of the Pitheciidae family, including the uakari and saki monkeys. Ornate titis have a monogamous mating system. A couple has a strong bond and stays together for years.

Oustalet’s Red Colobus

Species Name: Piliocolobus oustaleti

(Piliocolobus oustaleti) is another species of red colobus that lives in various forest types in the southern Central African Republic, southern South Sudan, northern Democratic Republic of the Congo, and northeastern Congo.

Pale-Thighed Langur

Species Name: Presbytis siamensis

The pale-thighed surili (Presbytis siamensis), also called the white-thighed langur, is a primate species in the Old World monkey family (Cercopithecidae). Pale-thighed langurs are savvy herbivores; it's fun to say they only eat plants and have a fussy palate, with a preference for young leaves, seeds, and fruits.

Panamanian Night Monkey

Species Name: Aotus zonalis

The Panamanian night monkey or Chocoan night monkey (Aotus zonalis) is a species of night monkey formerly considered a subspecies of the grey-bellied night monkey in the Aotidae family. Panamanian night monkeys are sympatric with other species. They do not compete for resources with other animals in their range due to their alternate schedules.

Phayre’s Langur

Species Name: Trachypithecus phayrei

Phayre's leaf monkey (Trachypithecus phayrei), also called the Phayre's langur, is a species of Lutung endemic to South and Southeast Asia. The name commemorates the late Sir Arthur Purves Phayre, a lieutenant general in the British Indian Army and commissioner of the entire province of former British Burma.

Purple-faced Langur

Species Name: Semnopithecus vetulus

The purple-faced langur (Semnopithecus vetulus), also called the purple-faced leaf monkey, is an Old World species native to Sri Lanka. The purple-faced langur is found in the closed forests of Sri Lanka's mountains and in the southwestern part of the country known as the 'wetland'.

Pygmy Marmoset (Finger Monkey)

Species Name: Cebuella pygmaea

The pygmy marmoset (smallest monkey), genus Cebuella (also known as Finger Monkey), is a small genus of New-World monkeys endemic to the tropical rainforests of the western Amazon Basin in South America. Pygmy marmosets are also highly territorial, using scent glands to mark territories of up to 100 hectares.

Red-bellied Monkey

Species Name: Cercopithecus erythrogaster

The red-bellied monkey (Cercopithecus erythrogaster), also called the red-bellied guenon or white-throated guenon is a diurnal primate living in the trees of tropical rainforests or tropical areas in Benin and Nigeria. The red-bellied monkey was once considered extinct due to constant hunting for fur on its unique red belly and white front legs.

Red-Shanked Douc Langur

Species Name: Pygathrix nemaeus

The red-shanked douc langur is an Old-World monkey species that is one of the most colorful primates. Red-shanked douc langurs are genetically similar to gray-shanked douc langurs; however, they are considered a different species due to their different biological characteristics.

Río Cesar White-fronted Capuchin

Species Name: Cebus cesarae

The Río Cesar white-fronted capuchin (Cebus cesarae) is a gracile capuchin monkey native to the Cesar River Valley in northern Colombia. Like other monkeys of the genus Cebus, the Río Cesar white-fronted capuchin is named after the order of the Friar Capuchins because the crests of these friars closely resemble the coloring of the monkey's head.

Roloway Monkey

Species Name: Cercopithecus roloway

Roloway monkeys (Cercopithecus roloway), also called Roloway guenons, are Old World monkeys native to Ghana and the Ivory Coast. Roloway monkeys resemble Diana monkeys in appearance, a species with which they were once confused.

Rondon’s Marmoset

Species Name: Mico rondoni

Rondon's Marmoset (Mico rondoni), also called the Rondônia marmoset, is a small species of monkey in the Callitrichidae family found in the southwestern Amazon of Brazil. Rondon's marmoset was only described in 2010, and its name refers to the famous Amazon explorer Cândido Rondon.

Saban Grizzled Langur

Species Name: Presbytis sabana

Saban Grizzled Langur was once thought to be a subspecies of the Hose's langur, Presbytis hosei (as Presbytis hosei sabana). The Saban grizzled langur is endemic to the island of Borneo in the Malaysian province of Sabah, with part of its range in Indonesia.

Schmidt’s Red-tailed Monkey

Species Name: Cercopithecus ascanius

The Schmidt's red-tailed monkey, also called the red-tailed guenon, Schmidt's guenon, or black-cheeked white-nosed monkey is a primate species in the Cercopithecidae family. The Schmidt's red-tailed monkey is named for its red coloration on the underside of its tail, as well as the bicolor coloration of its tail as the reddish color increases from the base to the tip.

Sclater’s Guenon

Species Name: Cercopithecus sclateri

(Cercopithecus sclateri), also called the Sclater monkey and Nigerian monkey is an Old-World monkey. Sclater's guenon is an Old-World monkey first described by Reginald Innes Pocock in 1940 and named for zoologist and ornithologist Philip Sclater.

Selangor Silvered Langur

Species Name: Trachypithecus selangorensis

The Selangor silvered langur (Trachypithecus selangorensis) is a leaf monkey living on the west coast of the Malay Peninsula. Like most leaf monkeys, the Selangor silvered langur usually lives in groups of a single adult male and several adult females and their young offspring.

Shortridge’s Capped Langur

Species Name: Trachypithecus shortridgei

The Shortridge's capped langur (Trachypithecus shortridgei) is a colobine primate inhabiting low to medium evergreen and semi-evergreen forests east of the Chindwin River in northeastern Myanmar and southwestern Myanmar, China, in the Nu and Dulong valleys.

Silvered Langur

Species Name: Trachypithecus cristatus

The silvery Lutung (Trachypithecus cristatus), also called the silvery langur or silvered leaf monkey is an Old-World monkey. Silvery Lutungs primarily live in trees.

Sooty Mangabey

Species Name: Cercocebus atys

The sooty mangabey, also called the white-collared or white-crowned mangabey is a predominantly terrestrial Old-World monkey. Sooty mangabeys remember the location of the fallen fruit and can tell whether or not a tree is bearing fruit.

Southern Muriqui

Species Name: Brachyteles arachnoides

The southern muriqui or woolly spider monkeys (Brachyteles arachnoides) are scattered across southeastern Brazil, from Bahia north to Sao Palo south. The southern muriqui is one of the largest primates in South America, with males weighing around 15 kg and females around 12 kg.

Southern Patas Monkey

Species Name: Erythrocebus baumstarki

The Southern Patas Monkey (Erythrocebus baumstarki), native to Tanzania, is a critically endangered primate known for its speed, elusive nature, and striking coloration. Once widespread, its population now teeters between 100–200 individuals due to habitat loss and human threats. Inhabiting open acacia woodlands, these ground-dwelling monkeys play a vital ecological role in seed dispersal and insect control. Conservation efforts are urgently needed to protect this rare species and restore its shrinking habitat range.

Spix’s Night Monkey

Species Name: Aotus vociferans

The Spix's night monkey (Aotus vociferans), also called the Spix's owl monkey, Colombian gray nocturnal monkey, and noisy night monkey is a species of night monkey native to South America.

Spix’s White-fronted Capuchin

Species Name: Cebus unicolor

Spix's White-fronted Capuchin (Cebus unicolor) is a species of a gracile capuchin monkey. The species is widespread in the upper Amazon basin in Peru and Brazil. It is also present in northern Bolivia. According to the genetic studies by Boubli et al., Ryland and Mittermeier elevated it to a distinct species.

Sun-Tailed Monkey

Species Name: Allochrocebus solatus

The sun-tailed monkey (Allocrocebus solatus) is among the most understudied primates in its habitat. Discovered as a new species in 1988, it is classified as a guenon, a member of the Cercopithecus genus, but later moved to the Allochrocebus genus.

Tana River Mangabey

Species Name: Cercocebus galeritus

Tana River Mangabeys are medium-sized monkeys with long, light gray hair covering most of their bodies. Tana River Mangabeys are highly social animals, living in multi-female social groups averaging 27 individuals in size.

Tana River Red Colobus

Species Name: Piliocolobus rufomitratus

The Tana River red colobus (Piliocolobus rufomitratus), also called the eastern red colobus, is a critically endangered primate species in the Cercopithecidae family. The Tana River red colobus monkeys are the only one of 18 species of red colobus that do not live in the tropical rainforest.

Tarai Gray Langur

Species Name: Semnopithecus hector

The Tarai gray langur (Semnopithecus hector) is an Old-World monkey and was once thought to be a subspecies of the northern plains gray langur. The Latin name for Tarai gray langurs is inspired by Hector, the prince of Troy.

Tenasserim Langur

Species Name: Trachypithecus barbei

Tenasserim lutung (Trachypithecus barbei) is a species of lutung. It occurs in Thailand and Myanmar. The species derived its common name from the Tenasserim Hills.

Tibetan Macaque

Species Name: Macaca thibetana

The Tibetan macaque (Macaca thibetana), also called the Chinese stump-tailed macaque is a macaque native to eastern Tibet, eastern Guangdong, and northern Shaanxi in China. Tibetan macaques are the largest of the macaques and have a strong, muscular build with dense fur that ranges in color from gray to brown.

Tufted Gray Langur

Species Name: Semnopithecus priam

The tufted gray langur (Semnopithecus priam), also called the Coromandel sacred langur and the Madras gray langur, is an Old-World monkey, one of the langur species. These langurs are generally shy and only descend when there is no visible danger.

Urubamba Brown Titi

Species Name: Plecturocebus urubambensis

The Urubamba brown titi (Plecturocebus urubambensis) is a species of Titi, a New World monkey native to Peru. This species is found east of the Tambo River and west of the Urubamba, Manú, and Madre de Dios rivers.

Vervet Monkey

Species Name: Chlorocebus pygerythrus

The vervet monkey (Chlorocebus pygerythrus) is an Old World monkey of the Cercopithecidae family endemic to southern and eastern Africa. Not only can vervet monkeys skilfully navigate through the treetops, but they can also swim.

White-fronted Langur

Species Name: Presbytis frontata

The white-fronted surili (Presbytis frontata) is a primate species in the Cercopithecidae family, the Old World monkeys. This species prefers to eat immature leaves than more mature leaves.

Wolf’s Mona Monkey

Species Name: Cercopithecus wolfi

The Wolf's mona monkey (Cercopithecus wolfi), also called the wolf monkey, is a colorful Old-World monkey in the Cercopithecidae family. Wolf's mona monkeys have huge cheek pouches.

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