A Scottish keep that appeared in the 1975 film Monty Python and the Holy Grail has become caught up in a mystery about where bats hibernate.Experts have been intrigued about where
pipistrelle, which roost in large numbers in Doune, Central Scotland, in summer, spend the winter.
Just over 30 have been counted in Doune Castle, which was used in the film.
Meanwhile, bat watchers in the far north are monitoring for a species which may spread with global warming.
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©PA
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Pipistrelle come in two varieties - soprano and common
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