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Volunteer cavers helping build a huge steel gate to protect endangered gray bats that hibernate in Hubbards Cave, Tennessee. Due to protection, this colony grew by over 400,000 over several decades. Space above the gate allows bats to fly over. Conservation
BCI SpecialHubbards CaveMerlin TuttleMerlin Tuttle's Bat ConservationTennesseeU.S.building gatecaver volunteersconservationfield work