Ours is an Eastern Screech Owl. Here?s a photo from just a few minutes ago :
I made the owl box almost 3 years ago. We had never had anything in them except a flicker (woodpecker) that I hazed out of there (because it was waking me up at 5:30 AM!) and another bird we thought may have been a starling. Then on Christmas morning I walked out and looked up and there she was (we hope it's a she because we'd like to see owlets.)