A mysterious illness has been killing thousands of bats in New York and New England for the past two years, and it has now begun to spread to bats in New Jersey and Pennsylvania, environmental officials in those states said.
The disease causes bats to crawl out of their hibernation spots prematurely during the cold winter months and they end up dropping dead because they burn up crucial fat reserves. It also causes some bats to crawl further into cooler sections of their hibernation spots in an attempt to cool rising body temperatures, the New Jersey Star-Ledger reported.