Kadiak Bear Ursus middendorff Merriam Length. Skin, 10 feet. Skull, 15 inches. Description. Largest of the American bears. Colour similar to the grizzly but skull presenting many points of difference. Range. Kadiak Island. This enormous bear and the allied Yakutat and Sitkan bears are restricted to Alaska and adjacent islands. They present differences of structure from both the grizzlies and black bears and are larger than either.