This is a photo of my tiny friend who likes to live alone. It has been here since late March. It is much smaller than a little brown. It is using my largest most ventilated house with rough cedar baffles and likes the 1 inch spaced chamber best of all.
Frank, the last couple years in the spring I've had a pair of tiny bats roosting tight together always by themselves in a box.....they appear darker than the little browns......maybe one of these springs I'll have to get a better look to see if they are a different species.....
Jack, here is a photo of the same house which was in a different location at another season. The little brown bats love the little 3 chamber. 2010-bat-photo-the-year-t968.html