We have had bats living in our barn and shed since we moved here in 1987. I assume they were around before then too, but I can't swear to it. One of my summer pleasures
An article in our paper about colonies of bats being wiped out by white nose syndrome reminded me that I hadn't done a batwatch yet this year. I went out a little too early the first time, so popped out every 15 minutes or so to watch the roofline, until it was fully dark. I checked again Monday night- nothing. I am so sad. I liked watching them fly overhead and I liked the bugs they ate. Bats just were part of our summer life and now they aren't, and there is nothing I can do to bring them back.
I did send the bat-survey-people an email letting them know of the colony disappearance. Apparently it will take a long time for the bat population to rebound, if it can, since the females have just one pup each year. We'll have to wait and see.