Lang's red colobus

{{Short description|Species of Old World monkey}}

{{Speciesbox

| name = Lang's red colobus

| image =

| status = EN

| status_system = IUCN3.1

| status_ref = {{cite iucn |author= Hart, J.|author2=Laudisoit, A. |author3=Struhsaker, T.T. |author4=Oates, J.F.|title= Piliocolobus langi |year= 2020|page= e.T18261A166605018 |access-date= 13 November 2021}}

| genus = Piliocolobus

| species = langi

| authority = (J. A. Allen, 1925)

| range_map = Distribution Piliocolobus langi.png

| range_map_caption = Lang's red colobus range in the Democratic Republic of the Congo

| synonyms = Piliocolobus foai ellioti
Piliocolobus rufomitratus ellioti

| synonyms_ref =

}}

Lang's red colobus (Piliocolobus langi) is a species of red colobus monkey. Historically it had been treated as a subspecies of the Central African red colobus, (P. foai){{MSW3 Groves | pages = 169|id=12100625}} but more recent taxonomies generally treat it as a separate species.{{cite book|title=Handbook of the Mammals of the World: Volume 3, Primates|year=2013|isbn=978-8496553897|publisher=Lynx|editor= Mittermeier, Russell A. |editor2=Rylands, Anthony B. |editor3=Wilson, Don E.|author=Zinner, D. |author2=Fickenscher, G.H. |author3=Roos, C.|page=710}}{{cite book|title=An Introduction to Primate Conservation|author=Groves, C.P.|editor=Wich, Serge A. |editor2=Marshall, Andrew J.|chapter=Species concepts and conservation|pages=45–47|year=2016|isbn=9780198703396}}{{cite book|title=All the World's Primates|author=Ting, Nelson|editor=Rowe, Noel |editor2=Myers, Marc|pages=540–541|year=2016|publisher=Pogonias Press|isbn=9781940496061}}

Lang's red colobus lives in lowland rainforest in the northeastern portion of the Democratic Republic of the Congo between the Lualaba River and the Aruwimi-Ituri River. It eats leaves, fruit, flowers, buds and possibly seeds. Males have a head and body length of about {{convert|50|cm|in|lk=on|abbr=on}} with a tail length of about {{convert|66.5|cm|in|lk=on|abbr=on}}. Females have a head and body length about {{convert|48.5|cm|in|lk=on|abbr=on}} with a tail length of between {{convert|44|and|66.5|cm|in|lk=on|abbr=on}}. Males weigh about {{convert|9|kg|lb|lk=on|abbr=on}} and females weigh about {{convert|7.7|kg|lb|lk=on|abbr=on}}.