3.Next

Bracken Cave is a cave located in southern Comal County, Texas, outside the city of San Antonio. The -wide crescent shaped opening to the cave lies at the bottom of a sinkhole, formed when the roof of the cave collapsed. It is the summer home to the largest colony of bats in the world. An estimated 20 million Mexican free-tailed bats roost in the cave from March to October, making it the largest known concentration

3.Next