Add Yahoo as a preferred source to see more of our stories on Google. Bracken Cave in Texas is home to 15-20 million Mexican free-tailed bats. Female bats head to the cave every year to give birth.

The city of San Antonio and conservation groups teamed up to buy land threatened with development near the Bracken Bat Cave, summer home to... In Texas, The World's Biggest Bat Colony Is Saved From ...

Every evening, millions of bats swarm out of a single cave in Texas, making it one of the most stunning natural phenomena to witness. The colony is so huge that it turns the sky black as they begin ...