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This BBC Wildlife Special profiles the polar bear, the Arctic animal that has to endure months of winter darkness, snow blizzards and ice, only then to have to cope with long spells of blinding sunlight. David Attenborough narrates.
There can be few places on earth as bleak as the Artic Circle - months of winter darkness, blizzards and ice followed by months of continuous blinding daylight. Welcome to the world of that most massive and formidable of hunters - the polar bear.