Great about the bats. You can get information from Bat Conservation International - http://www.batcon.org/
You could have insect eaters, fish eaters, pollenaters or fruit eaters. I know that Soaro cactus are pollenated by bats. BCI has done a lot of research and they have a lot of information. It is significant that they hang out in the open in trees rather than rolled in big leaves, under bark, in caves or houses. Would love to hear more. They all help us.