The evening bat is a relatively small, forest-dwelling bat. Evening bats are dark brown to yellow with short brown ears and a broad, hairless muzzle. This species looks like the big brown bat but is noticeably smaller. Learn to distinguish evening bats from big brown bats and other common Florida species of bats in this three-page fact sheet written by Emily Evans, Terry Doonan, and Holly Ober and published by the UF/IFAS Department of Wildlife, Ecology and Conservation.
http://edis.ifas.ufl.edu/uw435