Well i found an article on WNS on
White Nose Syndrome - Unexplained Bat Deaths in the Northeast
Wildlife biologists and land managers are alarmed by what many are saying is the most serious threat facing bat populations in human history: Tens of thousands of bats are dying in hibernacula in the northeastern United States and no one knows why. The mysterious affliction, reported in New York, Vermont, Massachusetts and most recently Connecticut, is dubbed “white-nose syndrome” because many affected bats develop prominent halos of white fungus surrounding their faces. White-nose syndrome (WNS) was first reported during the winter of 2006-2007 in a few hibernation caves near Albany, New York, where more than 8,000 bats died. During the winter of 2007-2008, it was reported in at least 18 additional caves and mines in four states. Some biogists put 2008 mortality could be as high as half-million animals that will not be documented until a 2009 census
if you want to read more go ahead
and here is how WNS looks like
