Devil's Sinkhole State Natural Area
Devil's Sinkhole State Natural Area is a natural bat habitat near the city of Rocksprings in Edwards County in the U.S. state of Texas. Carved by water erosion, the cavern is home to several million Mexican free-tailed bats that emerge at sunset during April through October. History The Devil's Sinkhole is a vertical natural bat habitat. The opening drops down to reveal a cavern some below. While likely known to native peoples, the cavern was first discovered in modern times by Ammon Billings, a local rancher leading a scouting party of five, west of Hackberry Creek in Edwards County in 1876. Billings fired at a marauding party of hostile Indians and believed he hit one. Fearing a trap, they did not pursue the Indians but returned to the area the following day, May 21, 1876 with their spouses. It was then that the sinkhole was first encountered by Ammon Billings. Billings wife, Lucinde Katherine Billings (née Stroop) and other wives in the returning party dubbed the sinkhole "The Devil's Sinkhole". H. S. Barber carved his name inside the cave in 1889. In 1968, the Devil's Sinkhole was designated as a National Natural Landmark by the National Park Service. The area