I posted this in another forum, but didn't get much of a response. So I'll try it here.

Within the first few episodes of the series, TWD established some basic rules on how Zombies behave and act:

1. Zombies are drawn towards sounds, movement, and smells.
2. Zombies will try to attack and eat any warm blooded animal.
3. Zombies notice and follow the behavior of other zombies, often setting off an ever growing chain reaction, creating zombie hordes.

I like these rules. They are clear and concise. What's more they are simple enough that you could believe a near mindless creature would follow them. And yet they still have a lot of potential to create dangerous situations: You can shoot a zombie to kill it, but the noise will only attract even more zombies toward you.

This is different from other depictions of the Zombie Apocalypse. Usually the whole approach you see elsewhere consists entirely of - Zombies attack people because that's just what zombies do.

My questions is: Are these rules original to "The Walking Dead?" Or did they "borrow" them from another source?