The zombies are the result of a devastating virus which crippled the Earth and devoured the host's brain cells turning them into blood thirsty monsters.
The zombies in this game were once human. There are very few animal zombies among the corpses but they DO exist.
The zombies are, for all intensive purposes, dead. What's left is shell of a body filled out with a predator inside.
The zombies have long nails and hair mostly.
The zombies are rotting but don't smell and usually aren't completely falling apart. They're held together mostly.
Zombies don't recognize their own gender most of the time.
Zombies cannot speak but communicate via groans, grunts and shrieks.
Zombies CANNOT climb which is why the wall works to keep them out.
Zombies not only eat brains but flesh as well. They're unstoppable killing machines who's only weaknesses include fire, water and explosions.
I am.... {Onyx/Cheshire/Morpheus/Lucretzia/Theron/Judas/Yoyo/Felicia}