Pictured Here Is A Big Brown Bat - This bat is an insectivorous medium-sized bat with brown fur. The Cottom's Wildlife Removal company commonly removes and excludes Big brown bats from homes in Ohio because they hibernate in the winter in attics and walls. Big brown bats and Little brown bat bite people that mess with them. Bats carry the rabies virus. A lung disease called Histoplasmosis is found in brown bat guano. The Big brown bat may also be a vector of the Saint-Louis encephalitis virus which can affect humans. It easts mosquitoes, corn root worms, beetles, ants, flies and wasps. Owls, raccoons and snakes eat big brown bats.