Currently there is a colony of flying-foxes currently calling the Sydney Botanic Gardens home. According to the news tonight the botanic gardens is planning on relocating these flying-foxes. They are currently tagging them and then plan on booming out large amounts of industrial noise when they leave the roost for their night-time foraging. This noise aimed at disturbing the bats enough that they won't want to return to the botanic gardens and get them to seek out 'more appropriate' digs. Certainly will be interesting to see whether this approach will have any success.
It is important to remember that there is little suitable habitat left for them to roost in in many urban areas and apparently there is also a shortage of food around at the moment. Surely this has got to mean that the bats are less likely to move on from a place that has reliable and suitable food and a place to hang out during the day, but hey I'm no expert.