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A black bear cub, top, climbs up a cottonwood tree Friday on the advice of its mother after she senses another bear walking into the area near the Mendenhall Glacier. A brown-colored black bear, right, walks along a path near the Mendenhall Glacier. The U.S. Forest Service closed parts of the Moraine Ecology Trail to visitors on Aug. 4 due to increased bear activity in and around Steep Creek.