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Elsewhere, a slightly larger estimated average weight of 260 kg (573 lb) was claimed for adult females.
The claws are deeply scooped on the underside to assist in digging in the ice of the natural habitat.
Because of their dependence on the sea ice, polar bears are classified as marine mammals.
For thousands of years, the polar bear has been a key figure in the material, spiritual, and cultural life of circumpolar peoples, and polar bears remain important in their cultures.
The range includes the territory of five nations: Denmark (Greenland), Norway (Svalbard), Russia, the United States (Alaska) and Canada.
although the latest research is based on analysis of the complete genomes (rather than just the mitochondria or partial nuclear genomes) of polar and brown bears, and establishes the divergence of polar and brown bears at 400,000 years ago.
These areas, known as the "Arctic ring of life", have high biological productivity in comparison to the deep waters of the high Arctic.