Zombies hunt humans like animals. First, they follow their quarry for miles, then they corner him, eat him alive, and leave him to rot in the forest. But they're still only the second most primitive creature in World War Z. Human beings still get first place in primitivity here. In our desire to preserve our own life, or way of life, we're shown stabbing each other in the back, stealing, killing, and being all around jerks to each other. While self-preservation is by no means a bad thing—we do it ourselves daily—it does make us reconsider our place in the hierarchy of nature.