Twenty species of butterfly have been recorded in the valley including the nationally scarce Marsh Fritillary (Eurodryas aurinia) and nationally vulnerable High Brown Fritillary (Argynnis adippe).
Of these Marsh Fritillary (Euphydryas aurina), High Brown Fritillary (Argynnis cydippe), Wood White (Leptidea sinapis) and Brown Hairstreak (Thecla betulae) all have a local distribution in Somerset.
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