The Myodes glareolus species has the biggest area occurrence out of all species of Muridae family, subfamily Arvicolinae. The bank vole occupies various types of forest ecosystems, fragmentised habitats with forest’s mosaics and flooded wetlands.The aim of this paper is to research chosen biological characteristics of our autochthony species.The main aim is to find out the influence of altitudinal gradient on somatic features of Myodes glareolus. According to our findings we can state that the average values of weight and body length are growing with rising altitude (Bergmann’s rule), but the difference between the lowland and subalpine zone is significant only in case of body weight (ANOVA-test). Opposite tendency was observed in case of tail length and hind foot, which are both getting smaller with rising altitude (Allen’s rule). This decrease is not proven statistically. It is known that individuals inhabiting higher altitudes (colder regions) in general have bigger bodies than individuals from lower altitudes (Bergmann’s rule). Shorter limbs or appendages in colder climates (Allen’s rule) provide better energy management for endothermic animals than in warmer climate (where animals are using bigger appendages to cool down their body).