Morphological investigation of kidneys, parotid glands, caecum, rectum, rumen, reticulum and feet in 58 roe deer Capreolus capreolus, shot in the forest (n=17) and in the field (n=41) did not show any significant differences between forest and field ecotypes. There were, however, differences in rumen papillary development, related to seasonal differences in forage quality and availability. Forest roe deer showed a wider range of the papillary surface enlargement factor than field roe deer in summer and had their optimal papillary development in autumn. Field roe deer showed a reduction of absorptive ruminal surface from summer to winter of almost 50%. Their adaptive range is within that of the species and does not indicate the ecotype separation.