Bracken Cave in Texas is the home of the largest colony of free-tailed bats in the world. In summertime, millions of them have babies there and become very hungry, which actually helps the local farms.
The notorious swamps that form the natural border between the states of Texas and Louisiana are home to some monstrous gators, turtles and fish, but plenty of smaller deadly creatures like the insidious fly trap plant hide there as well.
In California, the 146-miles long stretch of land between the scorched desert of Death Valley and the breezy mountaintops of Mount Whitney is home to some of the toughest creatures around.
Big Bend National Park lies on the U.S.-Mexico border in West Texas. It's best known for the Rio Grande and the Chihuahuan Desert but its amazing starscapes and tough wildlife are just as impressive.
