Polar Bears Ursus maritimus Formally Known as Thalarctos martimus Alaska is known for the varied and dense populations of bears in their natural habitats. If you head Far North, you may be able to see one of the closest relatives to the well-known large brown bear species, the polar bear. The polar bear is often recognized for its gigantic size, white fur coat, ability to adapt to hostile environments, and top-trophic-level [...]