Bats occationally get rabies. That much is true. One myth is that they attack humans when this happens...when an animal is sick generally it goes off into the wilderness to die alone and in a quiet place away from humans and other bats. As long as you don't go picking up bats from the ground or in unusual places you should have nothing to worry about. They will not attack the bunnies (or humans) if they happen to become sick. They are somewhat creepy looking, but they do a great job of keeping mosquito populations down and that's worth some merrit.