Bracken Cave

An estimated 20 million Mexican free-tailed bats roost in the cave from March to October making it the largest known concentration of mammals.

[1] The cave and undeveloped 1,521 acres (616 ha) around it are owned by Austin, Texas-based Bat Conservation International, which restores the land to support native vegetation and an abundant variety of wildlife.

The National Geographic Wild channel included Bracken Cave in the World's Weirdest series episode "Freaks of the Sky."

The Bracken Cave is the destination every March or April of over 20,000,000 Mexican free-tailed bats (Tadarida brasiliensis).

The bats consume several tons of insects per night, which according to research conducted in 2006, saves cotton farmers in south central Texas approximately $1,2 million a year.