While these bats take refuge all across the state, the largest congregation takes place at Bracken Cave.
Every night from March to October, these tiny creatures fly out of the 100-foot-wide crescent-shaped opening to feed.
Their emergence is so dense that it shows up on Doppler radar, according toTexasCoopPower.com.
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Besides tourists and bat lovers, a host of other creatures expectantly wait for their exit.
The Bracken site has had a significant role in Texas and US history.
The guano was later used as a rich fertilizer for croplands across the United States.
The move was instigated by a developer who proposed to build 3,500 homes near the cave, alarming conservationists.
