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Kruskal-Wallis tests were used to compare annual and seasonal activity for adult males, adult females with cubs, and adult females without cubs among grizzly bears (Ursus arctos) of the northern Yukon Territory; Tuktoyaktuk Peninsula and Richards Island, Northwest Territories; west-central Alberta; and Jasper National Park, Alberta. Seasons were spring-early summer (15 May to 21 July) and mid-summer-early fall (22 July to 21 September). Multiple comparisons of mean class ranks from significant K-W tests (P < 0.05) were used to identify satistically distinct population subsets. These comparisons showed adult females without cubs in northern Yukon used annual and seasonal ranges that were significantly smaller than those for the same class of bears in the other study areas. Adult males in northern Yukon had the smallest annual home ranges. Bears in northern Yukon had lighter spring weights, were older, had the highest population density (26-30 bears/1,000 km2) and estimated standing biomass (243 kg/100 km2), and were unexploited. Differences in home range size estimates were primarily attributed to differences in population densities among study areas.