An ecological study on the species richness, abundance and habitat association of rodentsrnwas carried out in the farmland, bushland, forest and grassland habitats of Yerer MountainrnForest Area from July 2010 to March 2011. By using Sherman live-trap and snap-traps, sixrnspecies of rodents and one species of shrew were identified within 3312 trap nights. Thernidentified species were: Lophuromys flavopunctatus (31.6%), Stenocephalemys albipesrn(18.0%), Arvicanthis dembeensis (16.4%), Arvicanthis abyssinicus (17.6%), Mus Mahometrn(13.7%), Dendromys mystacalis (2.2%) and the shrew species Crocidura fumosa (0.5%).rnThe variation in the species richness among the habitats was minimal. But there wasrnsignificant variation in their relative abundance during wet and dry seasons. Seasonalrnspecies composition within each habitat was not significant. C. fumosa and D. mystacalisrnwere the only species captured from the farmland and grassland habitats, during the wet andrndry seasons, respectively. Except for A. abyssinicus, C. fumosa and D. mystacalis all thernremaining species of rodents were trapped from more than one habitat. M. Mahomet wasrncommon to all habitat types during both seasons. High mean trap success (23.5%) andrnbiomass (4151g/hectare) was obtained from the farmland habitat. The proportion of adult,rnsub-adult and young individuals showed variation between species and season. Number ofrnpregnant females and embryo count showed seasonal variation. Stomach content analysisrnshowed high proportion of plant matter in all samples. The study recommended thernimportance of further ecotourism based investigations on Yerer Mountain.rnKey words: Biomass, Habitat association, rodents, species abundance and richness, trap success,rnYerer Mountain