In a region lacking caves and a society disapproving of leaving rotting trees, bats have a difficult time finding caverns to keep them safe form predators and the elements.
Constructing/placing a bat house in your backyard will greatly aid Wisconsin's three species of bats categorized as 'threatened'!
The Council Grounds State Park Wildlife Habitat currently features two different styles of bat houses; each style has positives and negatives.
The nursery box style house is a relatively easy build requiring fewer materials. Such a design is best mounted on the side of a building to help keep the house warm. See the link below to learn how you can build one!
The rocket box style house is a much more complicated build. The chambers have 360° access which allows the bats to roam about the house and pick which location is the perfect temperature for them; sides that receive more sunlight will be warmer and will better suit female and infant bats. See the link below to learn how you can build one!