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

Roland Seitre / Mandrill (Mandrillus sphinx) male, native to central Africa

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

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

Edwin Giesbers / Head portrait of male Mandrill (Mandrillus sphinx) Captive. Apenheul zoo; the Netherlands.

Mark Bowler / Mandrill (Mandrillus sphinx) male showing aggression, captive

Fiona Rogers / Wild mature male mandrill (Mandrillus sphinx) in gallery forest during dry season. Lope National Park, Gabon. June 2008.