We’ve got them on the farms too.. lovely things. Beautiful in flight and satisfying to watch them hang off the walls.
We have an upper window that reflects the sun as it tracks over the hill, we had similar problems with a couple of them last season finding them in the unkept bit of land just by the mistal.. Rob watched them track over the barn, head for the window then bounce off it and in a daze fall to the ground..
He reckoned the window was glaring the sun at them, bit odd but it’s the only reason he could think of. We can’t do much about it as the windows one of only two in a very large room..
We don’t see many dead, maybe a few a year?
Sad though.