"The Walking Dead" features various types of zombies that pose unique challenges for the survivors. The most common type is the roamer, which constantly roams in search of food and is slow and unintelligent. Lurkers, on the other hand, stay in one place and attack when stirred. Variant zombies are a different breed, with special abilities such as increased speed, intellect, and strength. Burners are a type of zombie with acidic skin and blood. The origin and evolution of these zombie types are still largely unexplained.