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Crayfish Invasion
Crayfish Invasion: Chris visits a stream which has been taken over by signal crayfish
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Winterwatch 2015 Highlights
Clips and exclusives from Winterwatch 2015 - live in the Cairngorms
More clips from Winterwatch
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A beaver sits down to eat in the midst of a fast flowing stream
Duration: 00:16
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Mute swans journey through a frozen landscape
Duration: 00:30
