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Polar bears are marine mammals, and spend much of their time on Arctic sea ice. Many adaptations make polar bears uniquely suited to life in icy habitats. Their fur is thicker than any other bears’ and covers even their feet for warmth and traction on ice. A thick layer of blubber beneath their fur provides buoyancy and insulation. Polar bears feed almost exclusively on ringed seals and bearded seals. They are also known to eat walrus and beluga whales and bowhead whale carcasses, birds’ eggs, and (rarely) vegetation. Polar bears are only found in the Arctic. The most important habitats for polar bears are the edges of pack ice where currents and wind interact, forming a continually melting and refreezing matrix of ice patches and leads (open spaces in the ocean between sea ice). At birth, polar bear cubs are 12 to 14 inches long and weigh around one pound.