Zombies can walk, think (in some cases), and attack living persons. Most zombies eat the brains of living humans. In zombies, the heart, lungs, and a small part of their brain still work. They may react to their environment, but they do not have consciousness. Zombies can use their skeleton and muscles to move. The skin is rotten. Its hair and nails are falling off. Zombies are usually covered in blood. They often have open wounds and are dressed in ripped clothes.