Thomas Marent / Sun-tailed Guenon (Cercopithecus solatus) mother with baby, Franceville, Gabon

Thomas Marent / Mandrill (Mandrillus sphinx) male in defensive posture, Lekedi Natural Preserve, Gabon

Thomas Marent / Mandrill (Mandrillus sphinx) male, Lekedi Natural Preserve, Gabon

Thomas Marent / Mandrill (Mandrillus sphinx) male, Lekedi Natural Preserve, Gabon

Thomas Marent / Mandrill (Mandrillus sphinx) male in defensive posture, Lekedi Natural Preserve, Gabon

Thomas Marent / Mandrill (Mandrillus sphinx) males in tall grass, Lekedi Natural Preserve, Gabon

Thomas Marent / Mandrill (Mandrillus sphinx) male, Lekedi Natural Preserve, Gabon

Cyril Ruoso / Chimpanzee (Pan troglodytes) female looking into the camera curiously, Gabon

Cyril Ruoso / Chimpanzee (Pan troglodytes) adult female with orphan baby she has adopted, Gabon

Cyril Ruoso / Chimpanzee (Pan troglodytes) adult female calling, Gabon

Cyril Ruoso / Mandrill (Mandrillus sphinx) adult male, Gabon

Cyril Ruoso / Mandrill (Mandrillus sphinx) close-up portrait of an adult male picking his nose, Gabon