"In a Cave Once Filled With Bats, Nothing But Eerie Silence"
"FARMINGTON, PENNSYLVANIA—In a chamber a few hundred feet underground known as the Stomach, long-time cave guide Lisa Hall is talking about bats. Less than a decade ago, this cave system was home to thousands of them—little brown bats, northern long-eared bats, Indiana bats, and big brown bats. Today, she says, when the staff spot a single individual (almost always a big brown bat, Eptesicus fuscus), they get excited."