Bat colonies can reach truly enormous sizes, some with millions of bats pouring out to feed each night, and one cave in Texas has the largest of them all.

This giant natural cave is right below one of America's favorite theme parks (and yes, you’re allowed to explore it).

The Ozark big-eared bat is a threatened species found only in a small number of caves in the southern central United States. Also known as the western big-eared bat, the long-eared bat ...