Buffalo Devels Sink Hole

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.
  • Established: 1985
  • Area: 1,859.7 acres (752.6 ha)
  • Governing body: Texas Parks and Wildlife Department
Data from: en.wikipedia.org