In this December 16, 2011 file photo, a cluster of little brown bats hibernate in New Mammoth Cave near LaFollette, Tenn. A fungal disease that has killed millions of bats has been confirmed in Washington state, the first time white-nose syndrome has turned up in the western United States, federal wildlife officials said Thursday, March 31, 2016. Testing by the U.S. Geological Survey's National Wildlife Health Center verified the disease in a little brown bat found in North Bend, about 30 miles east of Seattle. (Photo by Amy Smotherman Burgess/Knoxville News Sentinel via AP Photo)
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