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Little brown bats (Myotis lucifugus) hibernating in a Michigan mine. These bats hibernate for up to 8 months, leaving only 4 to rear young and store fat for the next winter! Hibernation
1993February 1993Merlin Tuttle's Bat ConservationMichiganMillie Hill MineMillie Hill Mine StoryNorth AmericaNorway MineSmugMugU.S.Vespertilionidaecensusinghibernatinghibernationlittle brown myotis Myotis lucifugusmine conservation