It is known that bats tend to migrate south for the winter and return to their roosts during the spring season. My wife and I are so excited to know that more than half of our colony of bats decided to stay in their bat house for the winter this year. They are officially in hibernation mode. I took a sneak peek early one morning, around 6 am with a flash light. This is something I would not recommend due to possibly disturbing them during their nap, however I just had to know if they migrated or not. It's going to be a good year for bats next spring. Now if only I could get those purple martins to occupy their houses this spring. My wife and I would have fulfilled our backyard wildlife habitat goal. :-)
Our bat houses where approx. 200 bats roosted last summer.