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The diet of Apodemus agrarius (Pallas, 1771) collected within three different localities was studied by means of stomach contents analysis. The rodents living in two of the localities (a suburban wood, and a remote area of city park) had the diet typical for the species, with seeds making up the bulk of diet (54-66%). The animals collected in the part of park closest to the city centre fed mainly of green food (71% of the diet). Hence the process of taking over urban and polluted areas by A. agrarius could be explained by the ability of the species to modify its food habits.