Here's something else that's been gathering dust in the garage. I got out my huge ladder and screwed this thing to the big tree out front. We can't see the box from the house since I wanted it to be not north facing, but it's easy enough to go and peek and and it's even possible we could set up an owl cam from the studio above the garage. Now we just need some owls to come live in it.
I found the Owl Shack FAQ a useful reference (even though this isn't an own shack).
I'll let you know if anyone moves in.
