Bracken Cave 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 of mammals.
The Bracken Cave serves as a summer residence for the largest bat colony on Earth. An estimated 20 million Mexican free-tailed bats congregate in the cave between March and October, making it the most significant gathering of mammals ever recorded.