Al zombies are Al that are automatically spawned when you choose to play infection mode with "Zombies" enabled. These zombies will try to kill all the uninfected players,thus making them all zombies.
They are shown to have the same health and the ablity to use their tencales like infected players.They have the same speed as the uninfected players.They also are capable of killing a human with a single strike.However they are unable to grab weapons and cannot dash. Al zombies doesnt devour dead bodys.
Sometimes, they come in a group.So it is dangerous to encounter them, thus can get you to be killed very easily.They can sometimes make nosies that draws attention to the humans.
They have blood on their armor and with bloody sharp claws and a zombie face withbout their helmets. Their appearance is nothing diffent from the infected players expect for their armor colour.