Leupold BX-4 Rangefinding Binoculars

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How big an entrance do they have/need?
(I really want to get up a barn owl box where I am).
I would welcome Screech owls.
The adults come and go in the open fronted barn throughout the year. They nest in the attic of another old shed 15 yards away. The opening to the attic is triangular shaped and about 10" at the widest part. As soon as the little ones start testing their wings they make it to the pole barn.
 
Ollin Magnetic Digiscoping Systems

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