Spatial distribution in mammals, and thereby home range size, is influenced by many different factors including body size, sex and age, reproductive status, season, availability of forage, availability of water, fragmentation of landscape, trophic level, subspecies, and intra- and interspecific competition. Spring-summer home range size variation of 17 radio-collared adult female roe deer was studied in 2001 and 2002, using kernel home range and Generalized Linear Model of habitat use. We included independent variables in our models. Spatial heterogeneity represented by edge density accounted for 31.55% of the variability in the size of home ranges in roe deer. The magnitude of the result was unexpected and highlights the potential importance of habitat heterogeneity in determining patterns of distributions in large herbivores. This result may be use in applied ecology. In fact, reducing amount of edge habitat may be useful as a tool to reduce roe deer density in forest.