Bonnie M. Blanchard 1983 <p>Habitat use by grizzly bears (<i>Ursus arctos</i>) was studied from 1977 through 1979 in a 20,000-km² area with Yellowstone National Park in the center. Of 1826 aerial radio locations of 46 instrumental grizzlies, 90% were in timber. Three-fourths of the locations were 100 m or less from an edge between timber and an opening. Timber over 3 m tall with a canopy cover of 26-75% accounted for 50% of all activity sites from March through November. The <i>Abies lasiocarpa/Vaccinium scoparium</i> community alone contained 23% of the total activity sites and 35% of the forested activity sites. Of 507 observations of feeding activity, 45% were recorded in timber over 3 m tall with a canopy cover of 26-100%, 34% in timber with a 0.1-25% canopy cover, 20% in open habitats, and 3% in timber less than 3 m tall. Ninety-nine percent of examined day beds were in forested communities.</p> application/pdf 10.2307/3872528 en International Conference on Bear Research and Management Grizzly bear: habitat relationships in the Yellowstone area article