Order Artiodactyla 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 1 637 722 book chapter 0-8018-8221-4 10.5281/zenodo.7316519 Tragelaphus eurycerus Ogilby 1836 Tragelaphus eurycerus Ogilby 1836 , Proc. Zool. Soc. Lond., 1836: 120 . Type Locality: "Their origin is unknown, but I have reason to believe they [the syntypes ] came from Western Africa". Vernacular Names: Bongo . Distribution: Rain forest of W Africa in Benin , Côte d’Ivoire, Ghana , Guinea , Liberia , Sierra Leone , and Togo ; C Africa in SE Cameroon , Central African Republic , Dem. Rep. Congo , NE Gabon , Republic of Congo , SW Sudan , Uganda (extinct); and in S Kenya . Occurrence in Equatorial Guinea ( Mbini ) questionable. Conservation: CITES – Appendix III ( Ghana ); IUCN – Endangered as T . e. isaaci , otherwise Lower Risk (nt). Discussion: Formerly placed in Boocercus . Reviewed by Ralls (1978 , Mammalian Species, 111).