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There are fears that a mystery virus is sweeping through Wales' largest single population of red squirrels. An investigation is underway after four of the rare animals were found dead in a matter of weeks.
It's worrying news for conservationists who've been working to bring the red squirrel population on Anglesey back from the edge of extinction over the last 15 years. Carole Green reports.
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Wildlife experts on Anglesey say a virus is killing off red squirrels on the island.