Up nextA mother sea otter nursing her fluff-ball baby through the early, chilly days of spring and black bear cubs emerge from their den.
Alaska: Earth's Frozen Kingdom
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Some grizzly bears come up with an ingenious way to fatten up during the short summer months whilst a young caribou calf joins a vast herd on its huge migration.
The eight month-long winter takes a grip on Alaska as we discover how life survives in 24 hours a day darkness until the sun returns.
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