[bad]Building a Zoo[/bad]: A Zoo is a designated place on the map, where you want to keep the zombie population. Since we cannot total wipe out zombies without getting a Global Respawn, we need to have a place for some to remain. Pick a corner of the map, preferable without buildings. Starting from close to town, and work your way out clear zombies that are not in your designated Zoo. If you have few or no zombies in your designated area, you might want to allow the closest Hordes to grow in that direction.