Re: The Walking Dead Season 3
They're just attracted to motion/sound in general. Regardless of the source. No "hive mind" needed.
I'm not so sure about that. Michonne's chained walkers seemed to be used as "bloodhounds" to sense the presence of other walkers (to avoid). As a living human, she would not need them to detect other humans, so they would only serve one purpose.
"...to be like God, you have the power to make the world anything you want it to be."