Chacma Baboon, Chobe River, Chobe National Park, Botswana

Gelada Baboon (Theropithecus gelada) opening its mouth, Simien Mountains National Park, Ethiopia

Gelada baboon in Simien Mountains National Park, Northern Ethiopia

Portrait of Gelada baboon in Simien Mountains National Park, Northern Ethiopia

Sumatran orangutan mother with baby climbing a tree in Gunung Leuser National Park, Northern Sumatra.

Sumatran orangutan climbing a tree in Gunung Leuser National Park, Northern Sumatra.

Africa, Rwanda, Volcanoes National Park. Female mountain gorilla with her young.

Portrait, Diademed Sifaka (Propithecus diadema), Madagascar, Africa

Crowned Lemur (Eulemur coronatus), clinging to a tree trunk, Madagascar, Africa

An infant orangutan ( Pongo pygmaeus ) close-up as he lays in his mother's large hand, Borneo, Indonesia, Indonesia, Borneo

Indonesia, Central Kalimatan, Tanjung Puting National Park. A female Bornean Orangutan and her sub-adult offspring hanging in a tree.

Indonesia, Central Kalimatan, Tanjung Puting National Park. A female Bornean Orangutan and her sub-adult offspring hanging in a tree.

Indonesia, Central Kalimatan, Tanjung Puting National Park. A large male Bornean Orangutan with distinctive cheek pads hanging in a tree.

Indonesia, Central Kalimatan, Tanjung Puting National Park. A large male Bornean Orangutan with distinctive cheek pads yawns while hanging in a tree.

Indonesia, Central Kalimatan, Tanjung Puting National Park. A male Orangutan calling.

Yaksha Guardian, ape-like guardian figures in front of the Mandapa, Khmer Hindu temple Banteay Srei, Angkor region, Siem Reap Province, Cambodia, Asia

Young Chacma Baboon silhouette, Chobe River, Chobe National Park, Botswana

Uganda, Western Uganda, Kibale Forest National Park. A juvenile Chimpanzee holds onto a palm in the Kibale Forest.

Uganda, Western Uganda, Kibale Forest National Park. A Chimpanzee in the Kibale Forest.

Uganda, Western Uganda, Kibale Forest National Park. A young Chimpanzee hangs from a tree in the Kibale Forest.

Uganda, Western Uganda, Kibale Forest National Park. A Chimpanzee in the Kibale Forest.

Gelada baboon in Simien Mountains National Park, Northern Ethiopia

Gelada baboon in Simien Mountains National Park, Northern Ethiopia

Gelada baboon in Simien Mountains National Park, Northern Ethiopia

a pair of Gelada baboon in Simien Mountains National Park, Northern Ethiopia

Gelada baboon in Simien Mountains National Park, Northern Ethiopia

Gelada baboon silhouette in Simien Mountains National Park, Northern Ethiopia

Gibraltar, Gibraltar rock, Gibraltar Barbary Ape

An elderly man walks in the historic center of Cervo, Imperia province, Liguria, Italy

Western lowland gorilla (Gorilla gorilla gorilla), male feeding, captive, Primate Sanctuary, Limbe, Southwest Region, Cameroon, Africa

Indonesia, Borneo, Kalimantan. Baby orangutan at Tanjung Puting National Park.

Uganda, Bwindi Impenetrable National Park. A male silverback moutain gorilla feedng on vines and lush vegetation mid-morning in the Impentatrable Forest.

Uganda, Bwindi Impenetrable National Park. A silverback male moutain gorilla resting early in the morning in the Impentatrable Forest.

Uganda, Bwindi Impenetrable National Park. A female moutain gorilla feedig on ripe figs early in the morning in the Impentatrable Forest.

Sumatran orangutan, Pongo Abelii, Gunung Leuser National Park, Sumatra, Indonesia

Black crested macaque, macaca nigra, Tangkoko National Park, Northern Sulawesi, Indonesia

Black crested macaque, macaca nigra, Tangkoko National Park, Northern Sulawesi, Indonesia

Bornean orangutan mother carrying a baby on a tree, Tanjung Puting National Park

Bornean orangutan portrait, Tanjung Puting National Park

Mural depicting the legend of the four friends, elephant, monkey, rabbit and rooster, Kharbadi Gompa, Phuentsholing, Kingdom of Bhutan

Chimpanzee (Pan troglodytes), female with young, native to Africa, in captivity, Netherlands, Europe

Africa, Uganda, Kibale National Park, Ngogo Chimpanzee Project. Wild, young adolescent male chimpanzee sits looking up into the trees.

Africa, Uganda, Kibale National Park, Ngogo Chimpanzee Project. Wild chimpanzee yawns while resting with others.

Africa, Rwanda, MUSAnze District, Volcanoes National Park, Ruhengeri, Kinigi. Gorilla, beringei beringei, Mountain gorilla. Baby and mother.

Africa, Rwanda, Volcanoes National Park. Portrait of a silverback mountain gorilla.

Africa, Rwanda, Volcanoes National Park. Portrait of a silverback mountain gorilla.

South Africa, Mpumalanga, Jane Goodall Chimpanzee Sanctuary - Pan troglodytes

South Africa, Mpumalanga, Jane Goodall Chimpanzee Sanctuary - Pan troglodytes

Africa, Ethiopia, Debre Libanos. Gelada Ape yawning

Crowned Lemur (Eulemur coronatus), Madagascar, Africa

Chimpanzee (Pan troglodytes) male portrait, Uganda, Kibale National Park

Young male Orangutan (Pongo pygmaeus) Portrait, Indonesia, Kalimantan, Tanjung Puting National Park

A portrait of a dominant male Orangutan (Pongo pygmaeus), Indonesia, Borneo

A close-up portrait of a juvenile Orangutan (Pongo pygmaeus), Indonesia, Borneo

A close-up of a dominant male orangutan ( Pongo pygmaeus ) face with large cheek flaps, Borneo, Indonesia, Indonesia, Borneo

Indonesia, Central Kalimatan, Tanjung Puting National Park. A male Bornean Orangutan with distinctive cheek pads.

Indonesia, Central Kalimatan, Tanjung Puting National Park. A female Bornean Orangutan climbing a tree.

Indonesia, Central Kalimatan, Tanjung Puting National Park. A Bornean Orangutan carries her baby on her back while wading across a stream.

Indonesia, Central Kalimatan, Tanjung Puting National Park. A female Bornean Orangutan and her two offspring hanging in a tree.

Indonesia, Central Kalimatan, Tanjung Puting National Park. A young Bornean Orangutan resting in a tree.

Indonesia, Central Kalimatan, Tanjung Puting National Park. A young Bornean Orangutan resting in a tree.

Indonesia, Central Kalimatan, Tanjung Puting National Park. A female Bornean Orangutan yawning.

Indonesia, Central Kalimatan, Tanjung Puting National Park. A baby Bornean Orangutan under its mother’s arm.

Indonesia, Central Kalimatan, Tanjung Puting National Park. A male Orangutan calling.

Indonesia, Central Kalimatan, Tanjung Puting National Park. A male Orangutan with his mouth open wide.

Indonesia, Central Kalimatan, Tanjung Puting National Park. A Bornean white-bearded Gibbon.

Indonesia, Central Kalimatan, Tanjung Puting National Park. A Bornean white-bearded Gibbon.

Asia. Sri Lanka, North Central Province, Anuradhapura District, Anuradhapura. A mother Toque Macaque with young feeding on a coconut discarded by pilgrims at the Poson Festival. It is an Old World mon...

Young mountain gorilla swinging on vines, Kwitonda Group, Mt Gahinga, Volcanoes National park, Rwanda.

Young mountain gorilla watched by its mother, Kwitonda Group, Mt Gahinga, Volcanoes National park, Rwanda.

Silverback mountain gorilla, Kwitonda Group, Mt Gahinga, Volcanoes National park, Rwanda.

Azy, Orangutan, photographed at the Great Ape Trust of Iowa

Female Sumatran Orangutan, Pongo pygmaeus abelii, Captive

Zaire, Virungas National Park. Portrait of wild silverback mountain gorilla

Chimpanzee sitting in the forest canopy. The remote Mahale Mountains, located on a bulge along the eastern shores of Lake Tanganyika, rise spectacularly 8,069 feet. The mountain slopes are covered w...

The beautiful montane forest ecosystem of the Virunga Volcanoes is the habitat of one of nature's rarest large mammals, the mountain gorilla (Gorilla gorilla beringei), which lives in forests between...

Yaksha Guardian, guardian figures in front of Mandapa and the southern Prasat, Khmer Hindu temple Banteay Srei, Angkor region, Siem Reap Province, Cambodia, Asia

Monkey at Hpo Win Daung Caves (AKA Phowintaung Caves), Monywa, Monywa Township, Monywa District, Sagaing Region, Myanmar

Chacma Baboon mother with baby, Chobe River, Chobe National Park, Botswana