I -think- (meaning I haven't looked yet) that there are waypoints in that "Skunk Mecca" that have tags of the form WP_ where is the tag of the skunks themselves. The NWN engine looks for tags like this when telling creatures what to do, where to go, etc. This is a semi-automatic feature designed to make it easy to construct walk paths for creatures and NPCs of a certain type.
Again, going off of memory there, so don't quote me.