Cyril Ruoso / Mandrill (Mandrillus sphinx) portrait, Gabon.

Dave Watts / Mandrill (Papio sphinx) female cleaning fingernails with stick, Captive

Dave Watts / Mandrill (Papio sphinx) male, Captive

Rod Williams / Male Mandrill (Mandrillus sphinx) Captive, occurs Cameroon and Gabon, Vulnerable.

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

Mark Bowler / Drill monkey (Mandrillus leucophaeus) adult male, portrait, captive

Fiona Rogers / Two wild female Mandrills (Mandrillus sphinx) with infants socialising. Gallery forest during dry season. Lope National Park, Gabon. July 2008.

Fiona Rogers / Wild female Mandrills (Mandrillus sphinx) carrying infants with horde. Gallery forest during dry season. Lope National Park, Gabon. July 2008.

Fiona Rogers / Wild female Mandrills (Mandrillus sphinx) with infants socialising. Gallery forest during dry season. Lope National Park, Gabon. July 2008.

Anup Shah / Wild Mandrill horde (Mandrillus sphinx) walking through gallery forest during dry season. Lope National Park, Gabon. July 2008.

Anup Shah / Wild sub-mature male Mandrill (Mandrillus sphinx) foraging in gallery forest during dry season. Lope National Park, Gabon. July 2008.

Anup Shah / Wild female Mandrills (Mandrillus sphinx) with infants in gallery forest during dry season. Lope National Park, Gabon. July 2008.