Neil Challis / Long-tailed macaque (Macaca fascicularis) playing on mangrove roots, Southern Thailand, March.
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Neil Challis / Long-tailed macaque (Macaca fascicularis) female suckling and grooming infants on a branch, Central Thailand, December.
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Neil Challis / Long-tailed macaque (Macaca fascicularis) hanging upside down on vines before falling off, Central Thailand, November.
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Neil Challis / Long-tailed macaque (Macaca fascicularis) female cuddling infant in rain, Central Thailand, November.
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Neil Challis / Long-tailed macaque (Macaca fascicularis) swimming across creek, running up mud bank, Southern Thailand, January.
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Neil Challis / Infant Long-tailed macaque (Macaca fascicularis) suckling and cuddling with mother, before being snatched by another adult, Central Thailand, September.
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Neil Challis / Female Stump-tailed macaque (Macaca arctoides) grooming infant on table, Central Thailand, September.
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Neil Challis / Long-tailed macaque (Macaca fascicularis) male and small puppy facing up to each other, Central Thailand, July.
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Neil Challis / Young Long-tailed macaque (Macaca fascicularis) sitting and biting its own toes, Central Thailand, June.
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Neil Challis / Long-tailed macaque (Macaca fascicularis) mother grooming leg of infant on branch, Central Thailand, June.
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Neil Challis / Long-tailed macaque (Macaca fascicularis) mother grooming head of infant on branch, Central Thailand, June.
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Neil Challis / Close up of Long-tailed macaque (Macaca fascicularis) male sleeping in a tree, Central Thailand, June.
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Neil Challis / Long-tailed macaque (Macaca fascicularis) foraging for food on muddy banks, Southern Thailand, March.
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Neil Challis / Two juvenile Long-tailed macaques (Macaca fascicularis) play fighting in a tree during a shower, Western Thailand.
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Joel Sartore / Photo Ark / Gray woolly monkey (Lagothrix cana) male picking up and holding its tail, Mantenedor da Fauna Silvestre Cariua. Endangered. Captive.
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Joel Sartore / Photo Ark / Japanese macaque (Macaca fuscata) two-week-old female lying down whilst sucking on thumb, Blank Park Zoo. Captive.
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Joel Sartore / Photo Ark / Common marmoset (Callithrix jacchus) female with a baby holding onto her back, University of Nebraska, Omaha. Captive.
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David Weiller / Two Squirrel monkeys (Saimiri sciureus) sitting in tree alert to surroundings, one scraching itself before climbing up branch to leave, Amazon rainforest, Leticia, Colombia.
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Jack Dykinga / Elves Chasm with maidenhair ferns and monkey flowers. Grand Canyon National Park, Arizona, USA.
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Ben Hall / Langur monkey (Semnopithecus) climbing tree in misty forest at dawn, India, November.
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Suzi Eszterhas / Northern muriqui monkey (Brachyteles hypoxanthus) juvenile aged one year, in tree playing with its mother's tail, RPPN Feliciano Miguel Abdala, Atlantic Forest, Brazil. June.
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Nick Hawkins / Central American spider monkey (Ateles geoffroyi) juvenile, Corcovado National Park, Costa Rica. January.
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Nick Hawkins / White-faced capuchin monkey (Cebus capucinus) in Tenorio Volcano National Park, Costa Rica
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Sylvain Cordier / Golden snub-nosed monkey (Rhinopithecus roxellana), two females embracing with baby, Qinling Mountains, Shaanxi province, China
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Sylvain Cordier / Phayre's leaf monkey (Trachypithecus phayrei) group on branch, Tripura state, India
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Sylvain Cordier / Golden snub-nosed monkey (Rhinopithecus roxellana),standing up on river boulders, Qinling Mountains, Shaanxi province, China
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Sylvain Cordier / RF-Gelada baboon (Theropithecus gelada) dominant male running. Debre Libanos, Rift Valley, Ethiopia. 2017. (This image may be licensed either as rights managed or royalty free)
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Sylvain Cordier / Gelada baboon (Theropithecus gelada) female carrying baby on back, dominant male in background. Debre Libanos, Rift Valley, Ethiopia.
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Anup Shah / Olive baboons standing on the lake shore. Gombe National Park, Tanzania.
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Oriol Alamany / Gelada Baboon (Theropithecus gelada) male lying in a forest glade at around 3,000 metres of altitude, Simien Mountains National Park, Amhara, Ethiopia.
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Lucas Bustamante / Toque Macaques (Macaca sinica) Polonnaruwa, Central Province, Sri Lanka
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Morley Read / Developing embryo of the Ecuadorian monkey frog (Phyllomedusa ecuatoriana), showing heart beating and blood flowing, Morona Santiago Province, Ecuador, (non-ex)
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John Shaw / Snow monkey or Japanese macaque (Macaca fuscata) female with baby clinging to her back. Jigokudani, Japan, February.
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Bernard Castelein / Rhesus macaque (Macaca mulatta), mixed group of female and juveniles, walking along a track, Keoladeo National Park, Bharatpur, India
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Bernard Castelein / Rhesus macaque (Macaca mulatta), juveniles playing in tree, Keoladeo NP, Bharatpur, India
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Bernard Castelein / Guianan brown capuchin (Sapajus apella) chewing on branch, Pampas del Yacuma Protected Area, Bolivia
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Bernard Castelein / Bolivian red howler (Alouatta sara), Pampas del Yacuma Protected Area, Bolivia
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Suzi Eszterhas / Red-shanked douc langur (Pygathrix nemaeus) infant sucking thumb while caretaker holds it. Animal was rescued from illegal wildlife trade, Endangered Primate Rescue Center, Cuc Phuong National Park, V...
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Matthew Maran / Delacour's langurs (Trachypithecus delacouri) resting, Van Long Nature Reserve,Ninh Binh, Vietnam. Critically endangered
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Matthew Maran / Red shanked douc langur (Pygathrix nemaeus) Son Tra Nature Reserve, Vietnam
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Robin Chittenden / Tufted grey langur (Semnopithecus priam priam) baby, Sri Lanka.
Claudio Contreras / Central American spider monkey (Ateles geoffroyi) juveniles hanging by tails and playing, Calakmul Biosphere Reserve, Yucatan Peninsula, Mexico, August
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Patricio Robles Gil / Kashir grey langur (Semnopithecus ajax) Dachigam National Park, Jammu & Kashmir, India.
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Anup Shah / Olive baboon (Papio anubis) male approaching with curiosity - remote camera. Masai Mara National Reserve, Kenya.
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Anup Shah / Vervet monkey (Cercopithecus aethiops) male scratching itself - remote camera . Masai Mara National Reserve, Kenya.
