The main objectives of the present study are to conduct detailed investigations onrnpopulation status, activity budget, foraging and ranging patterns of geladas living in thernGich area of the Simien Mountains National Park. Population census was conductedrnfrom early 2013 to late 2014 using a total-count sampling method. Activity data wererncollected using focal animal scan sampling method during ten days each month fromrnMay 2013 to April 2014. Average population size for two years of census period resultedrnin 661 individuals. There was a significant difference in the mean percentage of age/sexrncomposition of individuals. Geladas fed on 27 species of plants, but the number of speciesrnvaried markedly between seasons with dietary diversity being significantly more duringrnthe dry season. Festuca spp. formed a major dietary constituent throughout the year,rncontributing more than 78% of feeding records. Macronutrients had a complex influencernon food plant species selection in gelada. Gelada spent on average 56.7% of daylightrnhours feeding, 14.1% travelling, 10.7% resting, 17.5% socializing and 1.1% in otherrnnon-social activities. There was seasonal difference in activity budgets and age/sexrnclasses showed variation in time budgets. Geladas exclusively used cliff-face crevices asrnsleeping sites at night. The choice of top sleeping sites depended partly on the elevationrnof cliffs and protection that they provided gelada from natural predators.rnKey words: activity budget, cliff, diet, gelada, Gich, population status, SMNP