Attributes / relations provided by
♦ ¹Note on Drill (Mandrillus leucophaeus) Ecology and Conservation Status in Korup National Park, Southwest Cameroon, CHRISTOS ASTARAS, MICHAEL MUHLENBERG, AND MATTHIAS WALTERT, American Journal of Primatology 69:1–7 (2007)
♦ ²Feeding Ecology of Mandrills (Mandrillus sphinx) in Campo Animal Reserve, Cameroon, JIRO HOSHINO, PRIMATES, 26(3): 248-273, July 1985