Hey, I just started thinking about this the other day and have put a thread up about it. I have recently created this page as I see it shows potential. My theory and opinion is that zombies hunt in packs and have leaders. My points are;
1. Zombies when re-animated in anyway, they revert back to there very primal basic wild instinct.
2. Zombies move in packs.

These 2 points back up everything I will say.
When zombies are back to their basic instinct they want to eat. They move and eat in packs. When they do this usually a dominant figure in the group can be seen. Have a look at wild dogs... they hunt in packs and have leaders of their groups. If this is true, wouldn't the dominant figure also have a leadership sense as in the other zombies follow it.

If this is true it could be used as an advantage... You could kill the dominant figure and send the rest into confusion for maybe a few moments or more?
Please add on your opinions and theories.

-Mercob ( maker of page) Link to profile: http://www.zombiesurvivalwiki.com/account/Mercob
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Based on all the zombie movies/games I have come across, which is pretty much all any of us have to go by unless your hiding a real breakout, zombies moving in packs only seems to occur because the zombies are simply in one place at one time. I have never noticed any 'leader' in a group of zombies, just the lucky one who got hold of the survivor first or found a way into a building. Only exception I can think of is Big Daddy from Land of the Dead. ( Mercob:: OR 'I am Legend', even though this is in actual fact a vampire movie, It has a dominant figure [the movie version])

That being said, I also think you may have a fair theory here. If the reanimation does revert a brain back to baser instincts, the pack mentality could be part of it, even if just slightly. But that could mean zombies have an ability to think, if only quite below our level, and thinking zombies are not something I want to deal with. Read "Cell" by Stephen King, thinking zombies are a miserable problem.

-Mcskullcraken
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As far as I know; we have already established calling "Zombie packs" by the name of "Hordes" Personally I think horde sounds better. Which raises another issue. Would the hordes during Z-Day have a dominant leader?

-Marsden
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I will go with what Max Brooks says:"The truth is that zombies have no social organization to speak of. There is no hierarchy, no chain of command, no drive toward any type of collectivization. A horde of the undead regardless of size, regardless of appearence, is simply a mass of individuals. If several hundred gouls converge on a victim's location, it is because each one is drawn by its own instinct. Zombies appear to be unaware of one another." that about answers all my questions about it.

-Madmortagain