1. Winter
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Stephen Fry explores how nearly all life on Earth is impacted by our annual journey around the sun. Northern winters bring notably harsh conditions for polar bears, for example.
These are the stories of the scientists and conservationists who have have used pioneering techniques to uncover new behaviour, enabling us to film this extraordinary series.
This programme contains scenes of characteristic animal behaviour Turn on Parental controls
Stephen Fry and the natural world - as you've never seen it before
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