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Merlin Tuttle measuring the temperature in the entrance to an abandoned Iron mine in Wisconsin. The mine is used for winter hibernation by more than 100,000 bats of four species of bats. Field Work
Merlin TuttleMerlin Tuttle's Bat ConservationNeda Iron MineNeda MineNorth AmericaSmugMugU.S.Wisconsincavefield workice crystalsiron mine