Order Primates Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 1 111 184 book chapter 0-8018-8221-4 10.5281/zenodo.7316519 Piliocolobus kirkii (Gray 1868) [Colobus] kirkii Gray 1868 , Proc. Zool. Soc. Lond., 1868: 180 . Type Locality: Tanzania , Zanzibar . Vernacular Names: Zanzibar Red Colobus . Distribution: Zanzibar . Conservation: CITES – Appendix I and U.S. ESA – Endangered as Procolobus pennantii kirki ; IUCN – Endangered. Discussion: Considered a separate species by Dandelot (1974) and Groves (2001 c ) .