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.
Jack Dykinga / Elves Chasm with maidenhair ferns and monkey flowers. Grand Canyon National Park, Arizona, USA.
Ben Hall / Langur monkey (Semnopithecus) climbing tree in misty forest at dawn, India, November.
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.
Nick Hawkins / Central American spider monkey (Ateles geoffroyi) juvenile, Corcovado National Park, Costa Rica. January.
Nick Hawkins / White-faced capuchin monkey (Cebus capucinus) in Tenorio Volcano National Park, Costa Rica
Sylvain Cordier / Golden snub-nosed monkey (Rhinopithecus roxellana), two females embracing with baby, Qinling Mountains, Shaanxi province, China
Sylvain Cordier / Phayre's leaf monkey (Trachypithecus phayrei) group on branch, Tripura state, India
Sylvain Cordier / Golden snub-nosed monkey (Rhinopithecus roxellana),standing up on river boulders, Qinling Mountains, Shaanxi province, China
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)
Sylvain Cordier / Gelada baboon (Theropithecus gelada) female carrying baby on back, dominant male in background. Debre Libanos, Rift Valley, Ethiopia.
Anup Shah / Olive baboons standing on the lake shore. Gombe National Park, Tanzania.
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.
Lucas Bustamante / Toque Macaques (Macaca sinica) Polonnaruwa, Central Province, Sri Lanka
Morley Read / Developing embryo of the Ecuadorian monkey frog (Phyllomedusa ecuatoriana), showing heart beating and blood flowing, Morona Santiago Province, Ecuador, (non-ex)
John Shaw / Snow monkey or Japanese macaque (Macaca fuscata) female with baby clinging to her back. Jigokudani, Japan, February.
Bernard Castelein / Rhesus macaque (Macaca mulatta), mixed group of female and juveniles, walking along a track, Keoladeo National Park, Bharatpur, India
Bernard Castelein / Rhesus macaque (Macaca mulatta), juveniles playing in tree, Keoladeo NP, Bharatpur, India
Bernard Castelein / Guianan brown capuchin (Sapajus apella) chewing on branch, Pampas del Yacuma Protected Area, Bolivia
Bernard Castelein / Bolivian red howler (Alouatta sara), Pampas del Yacuma Protected Area, Bolivia
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...
Matthew Maran / Delacour's langurs (Trachypithecus delacouri) resting, Van Long Nature Reserve,Ninh Binh, Vietnam. Critically endangered
Matthew Maran / Red shanked douc langur (Pygathrix nemaeus) Son Tra Nature Reserve, Vietnam
Robin Chittenden / Tufted grey langur (Semnopithecus priam priam) baby, Sri Lanka.