[2] In 1901, Oldfield Thomas described two skins of Ruwenzori colobus zoological specimens that were collected at the northwestern slopes of the Ruwenzori Mountains in Bwamba Country of western Uganda.

[3] The Ruwenzori colobus is black with hair on the shoulders between 23 and 33 cm (9.1 and 13.0 in) long.

[2] The Ruwenzori colobus occurs at Lake Nabugabo and Rwenzori Mountains National Park in Uganda.

[4] Troops of 300 to 400 individuals inhabit Rwanda's Nyungwe National Park.

[7] Although all Colobus species are very sociable, they usually move on the troops of several hundred animals.