I leave the doors open all day, now that the weather is finally warmer. Even when I'm gone all day. I realize this is a real luxury, after years of living in cities where you make sure that everything is locked up before running even a short errand. While I was gone, the house seems to have been invaded by a bird, since there was fresh bird poop on my couch when I got home. Oddly, there was no sign of the bird itself, or even feathers showing that my cat had been in a battle with it. Another mystery.