Twenty six Ursus arctos were captured, radio-collared, and tracked in and around Plitvice Lakes and Risnjak National Parks. The largest male and female ranges were 224 km 2 and 147 km 2, respectively. Mean annual ranges were 128 km 2 and 58 km 2, respectively. Male ranges were 2-5 times larger than female ranges. The median straight-line distance between consecutive day locations was 1.5 km for all bears and the maximum distance was 8.5 km. Distances traveled daily by males and females were similar, but movements of females were restricted to smaller areas. Winter ranges were significantly smaller than ranges during other seasons. -from Authors