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 / Professor Matsuzawa, primatologist, in the field. Republic of Guinea December 2012.

Cyril Ruoso / Professor Matsuzawa, primatologist, in the field. Bossou, Republic of Guinea December 2012.

Cyril Ruoso / Chimpanzee (Pan troglodytes) biologist, Professor Matsuzawa, holding skull, Bossou, Guinea

Cyril Ruoso / Chimpanzee (Pan troglodytes) biologist, Professor Matsuzawa, Bossou, Guinea

Cyril Ruoso / Chimpanzee (Pan troglodytes) conservationist, Professor Matsuzawa, holding plant at nursery to establish wildlife corridor for chimpanzees, Bossou, Guinea

Cyril Ruoso / Chimpanzee (Pan troglodytes) conservationist, Professor Matsuzawa, at nursery to establish wildlife corridor for chimpanzees, Bossou, Guinea

Cyril Ruoso / Chimpanzee (Pan troglodytes) conservationist, Professor Matsuzawa, establishing wildlife corridor for chimpanzees, Bossou, Guinea