Suzi Eszterhas / Chimpanzee (Pan troglodytes) infant age 7 months, peeking out of grooming group, tropical forest, Western Uganda

Suzi Eszterhas / Portrait of young chimpanzee reclining and surrounded by adults (Pan troglodytes) Tropical forest, Western Uganda.

Suzi Eszterhas / Portrait of adult male Chimpanzee (Pan troglodytes) Tropical forest, Western Uganda.

Suzi Eszterhas / Juvenile Chimpanzee (Pan troglodytes) climbing in vines. Tropical forest, Western Uganda.

Suzi Eszterhas / Alpha male Chimpanzee (Pan troglodytes) self grooming. Tropical forest, Western Uganda.

Suzi Eszterhas / Mother Chimpanzee (Pan troglodytes) sitting, holding one year old infant. Tropical forest, Western Uganda.

Suzi Eszterhas / Chimpanzee (Pan troglodytes) resting on forest trail. Tropical forest, Western Uganda.

Suzi Eszterhas / Red colobus monkey (Procolobus badius) mother and infant, Kibale Forest, Uganda.

Suzi Eszterhas / Red colobus monkey (Procolobus badius) Kibale Forest, Uganda.

Suzi Eszterhas / Red colobus monkey (Procolobus badius) large male, Kibale Forest, Uganda.

Suzi Eszterhas / Red colobus monkey (Procolobus badius) mother and infant, Kibale Forest, Uganda.

Steve O. Taylor (GHF) / Close up of thermal hot springs at Semiliki valley, western Uganda. February 2012.

Steve O. Taylor (GHF) / Thermal hot springs at Semiliki valley, western Uganda. February 2012.

Steve O. Taylor (GHF) / Thermal hot springs at Semiliki valley, western Uganda. Februar 2012.

Steve O. Taylor (GHF) / Thermal hot springs at Semiliki valley, western Uganda. February 2012.

Fiona Rogers / Stulmann's blue monkey (Cercopithecus mitis stuhlmanni) baby aged 9-12 months feeding on a vine. Kakamega Forest South, Western Province, Kenya.

Fiona Rogers / Eastern Black-and-white Colobus (Colobus guereza) monkeys play fighting. Kakamega Forest National Reserve, Western Province, Kenya

Suzi Eszterhas / View of Kibale Forest, Western Uganda, July 2011

Suzi Eszterhas / Chimpanzee (Pan troglodytes) large male coming down from tree holding liana, tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) female biting male after bout of aggression in group, tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) large male with hair pile standing erect after dominance display, tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) mother and baby age two and a half, tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) portrait of young male, resting on forest floor, tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) feeding on Treculia africana fruit, tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) male showing fear grimace after bout of aggression, tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) large male resting on forest floor, tropical forest, Western Uganda

Suzi Eszterhas / Researcher and field assistant team, observing male chimpanzee (Pan troglodytes) in tropical forest, Western Uganda. No release available.

Suzi Eszterhas / Chimpanzee (Pan troglodytes) mother and juvenile age 5 years resting in tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) young male in tree in tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) infant aged four months suckling, tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) infant aged four months, in tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) mother and 4 month infant, tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) hand on tree, tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) mother carrying 4 month infant, tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzees (Pan troglodytes) eating Pseudospondias microcarpa seeds from other chimpanzee's feces, tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) mother grooming her juvenile offspring (with her 4 month infant and older baby belonging to other mother) in tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) mother and 4 month infant resting in tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) mother and 4 month infant resting in tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) mother and 4 month infant resting in tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) mother grooming juvenile, tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) mothers with infants and juveniles resting together, tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) infant age 4 months, portrait, tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) infant age 7 months playing while the group rests nearby, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) mother with 4 month infant resting on her foot, tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) 4 month infant resting on mother's foot in tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) juveniles playing above mother's head, tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) mother with 4 month infant suckling, tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) 4 month infant suckling, tropical forest, Western Uganda