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Why having a 'bird-brain' might not be a bad thing
Martin explains the neural density of a chimp and crow brain
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Winterwatch highlights—Winterwatch
The best wildlife moments from Winterwatch 2018
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
