Why Would Anyone Have A Leasehold?
Society & Culture3 mins ago
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For more on marking an answer as the "Best Answer", please visit our FAQ.Sometimes they will peck at windows in search of flies caught in webs and other bugs like that - in the same way that they tend to peck under window (or similar) ledges.
If you like seeing them you could try putting out some food for them to feed at instead. Peanuts and fatty products (from a petfood store) will give you a good mix of birds eg sparrows and blue tits.