They are out there, hiding inside of a geocache just waiting for someone to open the lid. They hunt for brains and SWAG as they move from one cache to the next, ready to find their next victim.
If that isn't scary enough, some even bring along a zombie dog!

For those who think that geocaching should be a little more creepy, the Zombie Travel Tags are made for you!
The Geocaching Zombie Travel Tag is trackable at Geocaching.com.