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It was immortalised in Macbeth, when the three witches prophesised that he should 'never vanquish'd be until; Great Birnam Wood to high Dunsinane Hill; Shall come against him'. But now there appears to be 'something rotten' in Birnam Wood. The only tree thought to survive from Shakespeare's time is at risk. Colin Blane reports. (Photo: Birnam Oak. Credit: Euan Nelson/Geograph)
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