The Walking Dead features various types of zombies that pose unique challenges for the survivors. The most common one is the roamer, which constantly roams around in search of food. Roamers are slow and unintelligent, often forming herds that can be dangerous. Lurkers, on the other hand, stay in one place and wait for food to come to them. They are silent and hidden, making them more dangerous than roamers. Variant zombies are a different type altogether, possessing special skills and abilities. The cause of these variants is still unknown, but they are growing in number over time. Another type of zombie, known as Burners, has acidic skin and blood and can severely burn anyone they touch. The cause of Burners is still not clear, but it is speculated that it may be linked to something they consumed.