Watch Dangerous Encounters

Weighing several hundred pounds and armed with vicelike jaws capable of dismembering its prey, the alligator snapper is a true prehistoric beast. But decades of commercial hunting have dramatically reduced its population. To find out if truly giant turtles still lurk in the waters of the Southeast, Brady heads to Louisiana.

Interactions between humans and bears can prove deadly, so to dissuade them from equating us with food, it's important to keep them away from our trash. Brady heads to Yellowstone Park to visit The Grizzly and Wolf Discovery Center testing facility, where they're working on building a better trash can. After baiting a trash can, they put it to the test with two 500-pound grizzlies and watch as the animals tear the trash can to shreds in a matter of minutes. From there, Brady's off to central Florida to check in on an animal armed with smarts and dexterity rather than brute strength -- the mischievous raccoon.

There's perhaps no place in the U.S. where pets face more dangers than in Phoenix, Ariz. One animal in particular has a reputation for attacking pets of all sizes the javelina, a hooved beast with razor-sharp tusks. To find out if the creature is as aggressive as people say he straps a stuffed dog to a remote-controlled vehicle and drives it into the cage of a captive javelina. An onboard camera records the attack quick, violent, full of teeth and tusks.