Ulster Wildlife study finds pine martens are present in almost double the number of sites than 2017.
Ulster Wildlife said its latest findings indicate a "remarkable turnaround".
He hopes the pine marten's recovery will boost red squirrel populations, which were previously decimated by the introduction of grey squirrels from north America in the 19th century.shows differing responses from both species when exposed to pine marten scentGrey squirrels do not change their behaviour or become more vigilant, therefore leaving them more vulnerable to the predator.
"Red squirrels have adapted to live alongside these native predators, unlike their non-native counterparts," Mr McIlwrath added.The "pine marten effect" has seen a slight decline in grey squirrel numbers
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