Bracken Cave is located just outside of San Antonio, Texas, at the bottom of a sinkhole created when the cave’s roof collapsed.

The access to the cave is through the crescent-shaped 100-foot-wide opening. The cave is world-renowned as the home to the world’s biggest colony of bats.

According to a rough estimate, more than 20 million Mexican free-tailed bats come to the cave from early March to the end of October to roost.

Austin-based Bat Conservation International owns the cave and the land around it. They restored the land and planted a range of native vegetation that supports a rich variety of wildlife.

Access to the cave is strictly controlled to protect this rare habitat and the bats, but Bat Conservation International organizes guided tours to the entrance to the cave to observe the bats as they fly out of the cave each evening throughout the summer.

25101 Natural Bridge Caverns Rd, San Antonio, TX 78266

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