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Every year grizzly bear families in North America depend for their survival on a spectacular natural event: the return of hundreds of millions of salmon from the Pacific Ocean to the mountain streams where they were born. In a TV first, underwater cameras record the ingenuity and fancy footwork they [...]

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Every year grizzly bear families in North America depend for their survival on a spectacular natural event: the return of hundreds of millions of salmon from the Pacific Ocean to the mountain streams where they were born. In this clip, dozens of hungry bears eagerly await the salmon that make [...]

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Find out more: http://www.bbc.co.uk/naturesgreatevents
The summer melt of Arctic ice opens up nearly three million square miles of ocean and land.
Duration : 0:3:24