The tail of P. bouvieri is long in proportion to its small body and is dark brown at the root, fading to brownish-red at the tip.

[2] In IUCN's 2008 and 2016 assessments, Bouvier's red colobus was classified as critically endangered with a note saying it was "possibly extinct".

[1] In February 2015, Lieven Devreese of Belgium and Gaël Elie Gnondo Gobolo of the Republic of the Congo launched an expedition to search for Bouvier's red colobus.

Starting from the town of Owando, the explorers soon spotted the monkey while travelling on the Bokiba River in Ntokou-Pikounda National Park.

[3][5][6] Bouvier's red colobus was previously known to scientists only from a handful of museum specimens collected between the late 1800s and early 1900s, although the species was known to the people living in the Bokiba River area.