No Faith in the Moral Standards of the Players as a Group

[Hank Chinaski]

I'm watching Walking Dead randomly. I have not watched it straight through so i don't know the conceits. There are fewer people, but seemingly no end of walkers. They are hungry, but have less to eat. If they don't eat do they die, like the living, or is the hunger almost like an OCD, like how Penske had to create socks, but wouldn't die if he didn't? And if needed for them to continue, can walkers evolve so the faster will likely survive and become the norm? I guess they don't reproduce so no?