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. Cody Buckalew/RiverTown Newspaper Group
Read the article: Maiden Rock/Bay City bat caves house 150,000
Read the article: State could close caves and mines - affects Pierce County
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