Zombies are the most prominent figure in the War Z universe. These flesh starved undead souls will go to whatever lengths to be able to feed on the bodies of the living. Zombies consist of the physical form of a human who had died from becoming infected with the Zombie Virus, which kills them within a certain period of time. The zombie's bodies are rotting and decaying forms, and can be noticed from long distances due to discoloration of the skin, awkward walking form, and seemingly mindless actions, as well as obvious blood smears from the struggle that took place while the previous human was becoming infected.
In order to kill a Zombie, you must destroy their brain through melee or ranged attacks with weapons found around the game world. Body shots will only temporarily stutter their actions and reactions, but will hardly ever result in a kill. Zombies will die from a single headshot from a gun or crossbow, but if you hit the body of the zombie, it will attack you.
Zombies cannot climb ladders or walls. Barricading yourself inside a structure is one way to avoid them. Jumping on a truck may protect you, but the zombies will continue to try to attack you, and will attack you if they are close enough. If you jump on a car, the zombies will often be able to climb it or even attack you from the side of the vehicle.
Zombies sometimes lie down on the ground and will not react unless disturbed by a nearby sound. These sleeping zombies can often be very hard to detect if they are lying down in tall grass or on bugged terrain.
 Sprinting Zombies
A large percentage of zombies now spawn with the ability to sprint. A zombie's sprint is slightly faster than a survivor's sprint, and these zombies are easily able to catch up to and attack a survivor, even if they are sprinting away. Due to certain lag (frame-rate) issues and server latency, it sometimes appears as if these zombies are teleporting. Visually, there is no way to ascertain if a zombie is able to sprint or not unless they are chasing a survivor.
 Screamer Zombies
A very rare mutation of the zombie virus, Screamers appear to act like any other regular zombie, walking or running, same model clothing and height. However upon becoming alerted to human presence, this zombie will let out a very loud scream, alerting any and all zombies including sleeping zombies, to amass a horde that will all chase the targeted human.
These zombies have no other defining characteristics, as they appear to have identical hp, movement, detection radius and xp, so they are impossible to spot before they have screamed.
 Super Zombies aka Mister Muscles
This extremely rare and dangerous mutation comes few and far between in number, but can be considered a boss due to its physical prowess. Super zombies are approximately 2 meters tall, wearing only lower body clothing, and have a herculean build of muscles all over its body. They are easily identified by their "albino" skin, and ape-like temperament; even when not alerted, these zombies can on occasion let out a small roar and beat their chest in a show of strength, however this is not a zombie to take lightly.
Upon meeting one, their noticeable behavior is that they appear to have double the detection radius of regular zombies, and react more to movement than sound (which may mean they are hard of hearing?); their footsteps are what give their proximity away, as this can be heard from up to 60-70 meters away, giving a fair advance warning when close to one. upon their alert of human presence, they charge forwards to their target, and withing 3 meters of its target, begins swinging powerful punches that have a larger range than a player's melee range; If by some chance they lose the ability to hit their target or are stopped from doing so, they can let out a loud roar that acts like a screamer's abilities, able to bring in any zombies in the area.
They have immense health amounts, as it takes anywhere from 15 to 25 Saiga shots at close range to kill one, or a couple of PKM ammo boxes; furthermore, they cannot be killed easily with lower caliber weapons as it is rumored that they have the ability for slow hp regeneration, so waiting between shots, or shooting weak guns is an ineffective method to killing one.
The only good news about a Super Zombie is the reward for killing one, upon their death whoever dealt the killing blow will receive a substantial 250xp reward, and a random rare or higher quality weapon will be dropped by the Super, ranging from Scar CQC's, M4's and other rare rifles, to extremely rare weapons such as Honey Badgers, and there is even one reported event of a Mauser sniper rifle being found.