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.

Pete Oxford / Man with performing pet Barbary ape (Macaca sulvanus) Morocco, June 2009

Angelo Gandolfi / Tourists walking past Barbary ape (Macaca sylvanus). Ifrane Nature Reserve, Middle Atlas Mountains, Morocco. March 2007.

Angelo Gandolfi / Barbary Ape (Macaca sylvanus) weaned baby (about six months old) trying to suckle. Male at right. Ifrane Nature Reserve, Middle Atlas Mountains, Morocco.

Bruno D'Amicis / Young Barbary Macaques (Macaca sylvanus) playing among Cedar (Cedrus atlantica) trees, backlit, Endangered species. Atlas mountains, Morocco, NW Africa

Bruno D'Amicis / Young Barbary Macaque (Macaca sylvanus) playing among Cedar (Cedrus atlantica) trees, backlit, Endangered species. Atlas mountains, Morocco, NW Africa

Ingo Arndt / Barbary ape feeding on grass {Macaca sylvanus} Morocco

Jose B. Ruiz / Barbary apes {Macaca sylvanus) with Straits of Gibraltar in background, Gibraltar, Spain

Jose B. Ruiz / Barbary apes playing on motorcycle {Macaca sylvanus} Gibraltar, Spain

Cyril Ruoso / Barbary Macaque (Macaca sylvanus) male with infant in snow-covered tree, winter, Middle Atlas Mountains, Morocco

Cyril Ruoso / Barbary Macaque (Macaca sylvanus) resting infant carried on its mother's back, Morocco

Cyril Ruoso / Barbary Macaque (Macaca sylvanus) mother with infant reprimanding her older child, Morocco

Cyril Ruoso / Barbary Macaque (Macaca sylvanus) infant riding on the back of an adult male, winter, Middle Atlas Mountains, Morocco

Roland Seitre / Barbary Macaque (Macaca sylvanus) mother and young on cement with city in background, Gibraltar, United Kingdom

Mark MacEwen / Barbary macaque (Macaca sylvanus) baby holding on to mother. Gibraltar Nature Reserve, Gibraltar. August.

Mark MacEwen / Barbary macaque (Macaca sylvanus), two adults with baby, overlooking town and ships in sea at sunset. Gibraltar Nature Reserve, Gibraltar. August 2018.

Mark MacEwen / Barbary macaque (Macaca sylvanus) baby sheltering between arms of mother and another adult. Gibraltar Nature Reserve, Gibraltar. August.

Mark MacEwen / Barbary macaque (Macaca sylvanus) on The Rock at sunrise. Gibraltar Nature Reserve, Gibraltar. August.

Mark MacEwen / Barbary macaque (Macaca sylvanus) sitting on railing above town and sea at sunrise. Gibraltar Nature Reserve, Gibraltar. August.

Mark MacEwen / Barbary macaque (Macaca sylvanus), two sitting on The Rock at sunrise, Strait of Gibraltar in background. Gibraltar Nature Reserve, Gibraltar. July 2018.

Mark MacEwen / Barbary macaque (Macaca sylvanus), two sitting on The Rock at sunrise, Strait of Gibraltar in background. Gibraltar Nature Reserve, Gibraltar. July 2018.

Karine Aigner / Tourists feed Barbary macaques (Macaca sylvanus) at the edge of the forest on the roadside outside of Azrou, Morocco.

Edwin Giesbers / Barbary macaques (Macaca sylvanus) in their enriched outdoor enclosure, Ouwehands Zoo, Rhenen, The Netherlands. Captive.; Ouwehands Zoo, Rhenen, The Netherlands. Captive.

Oriol Alamany / Barbary macaque (Macaca sylvanus) in the cedar and oak forests of the Moyen Atlas, Morocco, December

Oriol Alamany / Barbary macaque (Macaca sylvanus) in the cedar and oak forests of the Moyen Atlas, Morocco, December

Claudio Contreras / Barbary Macaque (Macaca sylvanus) grooming, Ifrane Forest National Park, Morocco, October

Claudio Contreras / Barbary Macaque (Macaca sylvanus) grooming, Ifrane Forest National Park, Morocco, October

Claudio Contreras / Barbary Macaque (Macaca sylvanus), Ifrane Forest National Park, Morocco, October

Claudio Contreras / Barbary Macaque (Macaca sylvanus) baby, Ifrane Forest National Park, Morocco, October

Sylvain Cordier / Barbary macaque (Macaca sylvanus), mother and baby, captive.

Edwin Giesbers / Barbary macaque (Maccaca sylvanus) with baby, scares off another juvenile, Gibraltar, UK, July.

Edwin Giesbers / Barbary macaque (Maccaca sylvanus) with baby, Gibraltar, UK, July.

Edwin Giesbers / Close-up of a Barbary macaque (Maccaca sylvanus) baby suckling, Gibraltar, UK, July.

Sylvain Cordier / Barbary macaque (Macaca sylvanus), infant and adult male, La Montagne des Singes, Alsace, France, captive

Sylvain Cordier / Barbary macaque (Macaca sylvanus), baby between two males (males use the baby to reduce aggression), La Montagne des Singes, Alsace, France, captive

Sylvain Cordier / Barbary macaque (Macaca sylvanus), baby with adult, La Montagne des Singes, Alsace, France, captive.

Sylvain Cordier / Barbary macaque (Macaca sylvanus), baby clinging onto adult, La Montagne des Singes, Alsace, France, captive

Sylvain Cordier / Barbary macaque (Macaca sylvanus), baby between two males (males use the baby to reduce aggression), La Montagne des Singes, Alsace, France, captive

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

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