Bats are one of the primary carriers of rabies on earth.
Most people that contract rabies get it from bats.
Does it have mold on it? There are entire populations that are getting wiped out by a white-ish mold on their bodies.
Be careful with that thing. (yes they are cute).
EDIT: Just saw that the little fella passed. It was probably the mold/fungus that's killing them by the millions.
If you want to read about the fungus, here's a link to a google o' articles:
http://www.google.com/search?q=why+are+all+the+bats+dying&ie=utf-8&oe=utf-8&aq=t&rls=com.yahoo:en-US
fficial&client=firefox