Pine martens are considered to be Ireland's rarest native mammal
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Rare pine marten 'photo-bombs' red squirrel survey

30 April 2014 Last updated at 18:26 BST

Scientists behind a red squirrel monitoring project in County Fermanagh have been surprised after finding an even more elusive mammal has been 'photo-bombing' their research.

Pine martens have been spotted by cameras in the Fermanagh woodlands, more than red or grey squirrels.

Julian Fowler reports.