The Brazilian free-tailed bat lives throughout Florida and is the state’s most common bat. They are important economically because they consume large quantities of insect pests. This 2-page fact sheet written by Holly K. Ober, Terry Doonan, and Emily Evans, and published by the UF Department of Wildlife Ecology and Conservation explains how to differentiate Brazilian free-tailed bats from velvety free-tailed bats and Florida bonneted bats.
http://edis.ifas.ufl.edu/uw424