Cyril Ruoso / Volunteer feeding young Chimpanzees (Pan troglodytes) Pandrillus Sanctury Rehabilitation Centre, Nigeria.

Cyril Ruoso / Chimpanzee (Pan troglodytes) baby playing with keeper, Pandrillus Drill Sanctuary, Nigeria

Cyril Ruoso / Chimpanzee (Pan troglodytes) adults and young, Pandrillus Drill Sanctuary, Nigeria

Cyril Ruoso / Local manon man in traditional robe with Chimpanzee (Pan troglodytes verus) skull, Bossou, Republic of Guinea. December 2012.

Cyril Ruoso / Local manon man in traditional robe with Chimpanzee (Pan troglodytes verus) skull, Bossou, Republic of Guinea. December 2012.

Cyril Ruoso / Professor Matsuzawa, primatologist, in the field with stone hammer and anvil tool used by local Chimpanzees (Pan troglodytes verus) Bossou, Republic of Guinea. December 2012.

Cyril Ruoso / Chimpanzee (Pan troglodytes verus) 'Jeje' adult male, Bossou, Republic of Guinea.

Cyril Ruoso / Chimpanzee (Pan troglodytes verus) mummified juvenile which was carried for several weeks after death by his mother. Bossou, Republic of Guinea

Cyril Ruoso / Chimpanzee (Pan troglodytes verus) 'Jeje' adult male displaying just before drumming on the buttress of a tree. Bossou, Republic of Guinea

Cyril Ruoso / Chimpanzee (Pan troglodytes verus) 'Fanwaa' juvenile, age five, male is displaying in front of the observers, throwing sticks. Bossou, Republic of Guinea

Cyril Ruoso / Chimpanzee (Pan troglodytes verus) 'Jeje' adult male, Bossou, Republic of Guinea

Cyril Ruoso / Chimpanzee (Pan troglodytes verus) 'Jeje' adult male , Bossou, Republic of Guinea