Boutourlini’s blue monkey (Cercopithecus mitis boutourlinii) is listed as a vulnerablernsub-species, which is endemic to south western parts of Ethiopia. This study wasrncarried out from July 2009 to April 2010 to provide data on the habitat use, feedingrnbehaviour, activity and ranging patterns of C. mitis boutourlinii blue monkey in the JibatrnForest. Jibat forest constitutes different habitat types including tree and bamboorndominated forests and bushlands with the surrounding farmlands. Study on twornselected groups (Group I and II) of the monkey was carried out in different habitat types.rnActivity pattern, feeding ecology and ranging behaviour were studied with 15 minutesrninterval scan sampling. Vegetation composition in the home range was determined byrnquadrat sampling method. The majority of their activity time was spent in feeding 49.9 %rnand 47.3% by Group I and Group II, respectively; followed by moving (20.14%) andrnresting (20.57%) by Group I. Group II spent 16.26% of total time moving and 22.5%rnresting. Monkeys of Group I spent 9.4% of their time for socializing while Group II spentrn13.9%. The time spent in other activities was very limited (