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.

Jami Tarris / Orangutan (Pongo pygmaeus) primatologist, Dr. Birute Mary Galdikas, and dominant female, Camp Leakey, Tanjung Puting National Park, Central Kalimantan, Borneo, Indonesia

Cyril Ruoso / Allison Jolly, a primatologist studying Ring-tailed lemurs. Berenty, Madagascar. October 2005.

Cyril Ruoso / Andrianome Vonjy Nirin, a Malagasy researcher studies impact of Lead Tree (Leucaena leucocephala) on the Ring-tail Lemur (Lemur catta). Plant is suspected of poisoning lemurs, Berenty Private Reserve,...

Pete Oxford / White-taile Titi (Callicebus discolor) biologist, Amy Porter, radio tracking individual, Tiputini Biodiversity Station, adjacent to Yasuni National Park, Amazon Rainforest, Ecuador

Tim Laman / Primatologist, Tom Butynski, wading across the Rio Ole, Bioko Island, Equatorial Guinea, Rapid Assessment Visual Expedition, International League of Conservation Photographers, January 2008. Model rel...

Mitsuaki Iwago / Chimpanzee (Pan troglodytes) visited by Jane Goodall, Gombe Stream National Park, Tanzania

Mitsuaki Iwago / Chimpanzee (Pan troglodytes) in cage visited by Jane Goodall, Gombe Stream National Park, Tanzania

Gerry Ellis / Chimpanzee (Pan troglodytes) with Doctor Jane Goodall and Dale Peterson, Gombe Stream National Park, Tanzania

Jabruson / Grave of Dian Fossey, primatologist, murdered in 1985, Parc des Volcans NP, Rwanda - memorial