When I bought our old farm house there were Jackdaws nesting in the chimneys. This was not conducive to seeing & breathing in the house when we lit a fire. The builder's merchants; when consulted said ," just shoot the b***ers."
We said, " Oh No you cannot do that to the poor little darlings!!"
Anyway I tried putting wire balloons on top of the Chimneys but the birds just pulled them off, or they coked up & smoked us out. I then built a nest box to give them an alternative,
but the Jackdaws ignored it & continued to throw sticks down the chimney. I then lost patience & took the original advice & shot the b***ers. The nest box was not used for several years but whilst shooting a fox from the attic Velux (as you do), I noticed a pair of Barn Owls on the roof. I heard them scratching around the box during the day & they come out like bats together at 20:00 hrs to hunt. They are very tolerant of me as I have had several barbecues below them & have shot 15 foxes from the attic window with the 6.5 since the 1st Jan.
It looks like I should have them for the next 20 years. I wonder if shooting so many foxes has helped them find more voles? They are incredibly vocal and snore louder than my wife & even hiss louder than the geese. It is a real privilege to have them.