The BBC Natural History Unit produces a wide range of programmes that aim to immerse a listener in…
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The Heath Fritillary butterfly was on the verge of extinction in Exmoor in 2001. Now, thanks to some targeted conservation work between the National Trust and Butterfly Conservation, this checkerboard-marked rare butterfly is increasing in numbers. Lionel Kelleway heads to a valley near Dunkery Beacon in the north of Exmoor National Park in search of one of Britain's rarest butterflies.
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