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Walrus: Two Tonne Tusker

8. Natural World: 2013-2014, Walrus: Two Tonne Tusker

Sivuqaq is an 18-year-old, larger-than-life Pacific Walrus. Can he become a dad?

The Last Frontier

6. Frozen Planet: The Last Frontier

What draws humans to the coldest and most hostile reaches of our planet?