Woodmouse

Dark blue dots show records since 2000
Mid blue dots show records from 1990 - 2000
Light blue dots show records from before 1990
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As with most small mammals, most of these records are either dead animals brought in by a cat, or skulls found in owl pellets. Woodmice are found on Skomer, but not Skokholm where there are only house mice.
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More information at http://www.abdn.ac.uk/mammal/woodmouse.shtml