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November 3, 2008
As the weather cools, upwards of 100,000 bats will make their way into the Wisconsin Industrial Sand Corp. mine in Maiden Rock to hibernate for the winter months. Their hibernaculum is in the oldest part of the sand mine, which no longer is actively worked.  
Bats huddle together for warmth on the high sandstone walls and  
ceilings of tunnels beneath about 30 acres in the Maiden Rock area.   
Another 50,000 bats can be found nights in the Bay City sand mine a few miles away. Cody Buckalew / RiverTown...
Maiden Rock/Bay City bat caves house 150,000
November 3, 2008 - 12:00am