Pete Oxford / Rhesus macaque dressed up for tourists {Macaca mulatta} Delhi India

Lucas Bustamante / Toque Macaques (Macaca sinica) Polonnaruwa, Central Province, Sri Lanka

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

Ernie Janes / Celebes crested macaque (Macaca nigra) infant, captive.

Jed Weingarten / Wild Wonders of China / Tibetan macaque (Macaca thibetana) carrying young baby, Tangjiahe Nature Reserve, Sichuan Province, China

Magnus Lundgren / Wild Wonders of China / Tibetan macaque (Macaca thibetana) juvenile climbing in a tree in Tangjiahe Nature Reserve, Sichuan Province, China

Cyril Ruoso / Long-tailed macaque (Macaca fascicularis) head portrait, Koram island, Khao Sam Roi Yot National Park, Thailand.

Cyril Ruoso / Long-tailed macaque (Macaca fascicularis) grooming, Koram island Khao Sam Roi Yot National Park, Thailand.

Cyril Ruoso / Long-tailed macaques (Macaca fascicularis) two juveniles sitting close together. Koram island, Khao Sam Roi Yot National Park, Thailand.

Cyril Ruoso / Long-tailed macaque (Macaca fascicularis) approaching camera, Koram island, Khao Sam Roi Yot National Park, Thailand.

Wim van den Heever / Japanese macaque (Macaca fuscata) youngster jumping over small stream, Jigokudani, Nagano, Japan. February.

Edwin Giesbers / Barbary macaque (Macaca sylvanus) profile, portrait, Gibraltar Nature Reserve, Gibraltar, June.

Edwin Giesbers / Barbary macaque (Macaca sylvanus) babies hand holding onto adults fur. Gibraltar Nature Reserve, Gibraltar

Edwin Giesbers / Barbary macaque (Macaca sylvanus) baring teeth as a sign of submission, Gibraltar Nature Reserve, Gibraltar,

Edwin Giesbers / Barbary macaque (Macaca sylvanus) youngster climbing, Gibraltar Nature Reserve, Gibraltar,

Edwin Giesbers / Barbary macaque (Macaca sylvanus) two sitting close together, Gibraltar Nature Reserve, Gibraltar, June.

Edwin Giesbers / Barbary macaque (Macaca sylvanus) portrait, Gibraltar Nature Reserve, Gibraltar, June.

Edwin Giesbers / Barbary macaque (Macaca sylvanus) baby sitting with mother, Gibraltar Nature Reserve, Gibraltar, June.

Edwin Giesbers / Barbary macaque (Macaca sylvanus) baby sitting with mother, Gibraltar Nature Reserve, Gibraltar, June.

Edwin Giesbers / Barbary macaque (Macaca sylvanus) portrait, Gibraltar Nature Reserve, Gibraltar, June.

Yukihiro Fukuda / Japanese macaque (Macaca fuscata fuscata) mother with rare white furred baby, Jigokudani Valley, Nagano Prefecture, Japan. June.

Yukihiro Fukuda / Japanese macaque (Macaca fuscata fuscata) rare white furred baby jumping, Jigokudani Valley, Nagano Prefecture, Japan. June.

Yukihiro Fukuda / Japanese macaque (Macaca fuscata fuscata) rare white furred baby calling, Jigokudani Valley, Nagano Prefecture, Japan. June.

Yukihiro Fukuda / Japanese macaque (Macaca fuscata fuscata) rare white furred baby playing with another baby. Jigokudani Valley, Nagano Prefecture, Japan. June.

Yukihiro Fukuda / Japanese macaque (Macaca fuscata fuscata) mother with rare white furred male baby, Jigokudani Valley, Nagano Prefecture, Japan. June.

Yukihiro Fukuda / Japanese macaque (Macaca fuscata fuscata) rare white furred baby playing with flower, Jigokudani Valley, Nagano Prefecture, Japan. June.

Yukihiro Fukuda / Japanese macaque (Macaca fuscata fuscata) mother with rare white furred baby, Jigokudani Valley, Nagano Prefecture, Japan. June.

Yukihiro Fukuda / Japanese macaque (Macaca fuscata fuscata) mother carrying rare white furred baby on belly, Jigokudani Valley, Nagano Prefecture, Japan. June.

Yukihiro Fukuda / Japanese macaque (Macaca fuscata fuscata) mother with rare white furred baby, Jigokudani Valley, Nagano Prefecture, Japan. June.

Anup Shah / Long-tailed macaque (Macaca fascicularis) juvenile sticking tongue out. Khao Sam Roi Yot National Park, Thailand.

Danny Green / Snow Monkey (Macaca fuscata) with snow covered paw in front of mouth, Nagano, Japan, February

Danny Green / Snow Monkey (Macaca fuscata) in snow, Nagano, Japan, February

Danny Green / Snow monkey (Macaca fuscata) close up with eyes cast down, Nagano, Japan, February

Danny Green / Japanese Macaque (Macaca fuscata) carrying young on back through snow, Nagano, Japan, February

Danny Green / Japanese Macaque (Macaca fuscata) carrying young on back through snow, Nagano, Japan, February

Aflo / Japanese macaque (Macaca fuscata) mother cuddling baby, Yamanouchi, Shimotakai District, Nagano Prefecture, Japan. June.

Christophe Courteau / Long-tailed macaques (Macaca fascicularis) grooming, with baby playing nearby, Bako NP, Sarawak, Borneo, Malaysia.

Roland Seitre / Rhesus macaque (Macaca mulatta) group sat on dome in urban setting, India.

Anup Shah / Long-tailed macaque (Macaca fascicularis) baby aged 2-4 weeks clinging to its mothers back. Bako National Park, Sarawak, Borneo, Malaysia.

Mark MacEwen / Japanese macaque (Macaca fuscata) relaxing in hot spring in Jigokudani, Yaenkoen, Nagano, Japan, February.

Mark MacEwen / Japanese macaque (Macaca fuscata) sleeping at hot spring in Jigokudani, Yaenkoen, Nagano, Japan, February.

Anup Shah / Japanese Macaque (Macaca fuscata) baby sitting on the edge of thermal hotspring pool. Jigokudani Yean-Koen National Park, Japan, February.

Anup Shah / Lion-tailed macaque (Macaca silenus) sub-adult male sitting in a tree. Anamalai Tiger Reserve, Western Ghats, Tamil Nadu, India.

Anup Shah / Lion-tailed macaque (Macaca silenus) female sitting with her baby aged less than 1 month. Anamalai Tiger Reserve, Western Ghats, Tamil Nadu, India.

Anup Shah / Lion-tailed macaque (Macaca silenus) baby aged less than 1 month playing in a tree. Anamalai Tiger Reserve, Western Ghats, Tamil Nadu, India.

Fiona Rogers / Lion-tailed macaque (Macaca silenus) female portrait. Anamalai Tiger Reserve, Western Ghats, Tamil Nadu, India. Apr 2013.