A Google search for "Frio Cave" makes the Uvalde County, Texas destination look like a tourists' dream. One quickly learns that the cave is home to tens of millions of Mexican free-tailed bats, and that you can sometimes witness the flapping horde streaming out of their dark, dank home just before sunset, clouding the sky in a "once in a lifetime experience." But Frio Cave has a darker history that visitors websites don't mention. More than fifty years ago, two humans contracted rabies while spelunking there. That humans would get infected with rabies while visiting a bat-infested cave isn't altogether...
