Red bats roost in trees, shrubs, brush and weeds.
The big brown bat prefers vacant buildings. Whereas the settlement of the prairie and its conversion to agricultural lands severely depleted prairie bird populations, mammals have not suffered to as great a degree. Some species, in fact, have either become more abundant or extended their ranges because of the greater diversity of habitats. The mammals present at Midewin thrive in the diversity of habitats that exist at the site. Some of these are true prairie species.