There is something about visiting the twilight zone of a cave. The constant struggle between light and darkness often creates a dramatic scene unlike anywhere else on Earth. "Plus, you usually don't get too filthy!" Bat Cave A protected site in eastern Kentucky. J. Chenger, J. Hempel, 1994
				"When doing winter bat surveys, we spend a large portion of our time just inside the entrance. At first glance it will seem like there are no bats present, until we search tiny cracks throughout the walls. Pennsylvania's big brown and small footed bats take the cold well, we have found dozens hibernating twelve inches deep in a quarter-inch wide crevice!" Pine Hill Cave Main entrance, eastern Kentucky J. Chenger, D. Bondi 1993