Seventeen adult wild boar (Sus scrofa) were radiotracked in the Maremma Natural Park fron March to September 1993, to determine home range size and the patterns of daily activity; 24-hr home range size averaged 33.2 ha (SE = 2.81) and 25.1 (SE = 1.73) calculated by the 100% and the 95% Minimum Convex Polygon respectively. No sex-or month-related differences were found in home range size nor in the daily activity. All the wild boar spent about 65% of their time being active. Activity usually started before sunset and stopped after sunrise, and was more synchronized to sunrise in all months except July. Most 24-hr cycles showed two active bouts: one nocturnal bout and a smaller one during the day. None of the radiocollared females bred, this could explain why sex related differences in home range size and activity patterns were not found. Wild boar were more diurnal if compared to those of other studies, and this could be due to the absence of human disturbance.