1. Spring

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. 4 February 2015. 50 min

A mother sea otter nursing her fluff-ball baby through the early, chilly days of spring and black bear cubs emerge from their den.

2. Summer

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. 11 February 2015. 50 min

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.

3. Winter

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. 18 February 2015. 50 min

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.