Owl holes are often found high up in the apex of a barn gable wall, to allow owls into the building to keep down the rodent population. These examples are from Yorkshire.pic.twitter.com/HSIshTM13h
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Amazing thank you. There are some very ornate ones, they must have loved barn owls as much as me!
Apparently they will eat up to 12 mice a night so pretty effective rodent control. These are fantastic owl holes beautiful.
I wondered what it was for! There's one on my house! 
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