And the bats came back...

We have bats. Again. Had them in 2005 and had them taken care of. At least we thought. We had netting up for about a year, and then a pest-control company sealed up the access point. But they came back. Apparently when they find a place to nest, they really want to stay there. So they found a new way in. After grilling Friday night, we sat out until after dusk, and counted 33 flying out of the house, through a space probably no bigger than 1/2" around. Unfortunately, they nest behind the dry wall in our bedroom right behind our bed, so we do hear them scratching around in the insulation. Also unfortunately is that they do help keep the mosquito population quite low around us, so in a sense I don't want them to go away. In my backyard, just not in my house.