Zombies are fictional creatures usually portrayed as reanimated corpses or virally infected human beings. They are commonly portrayed as anthropophagous in nature—labeling them as cannibals would imply zombies are still members of the human species, and expert opinions quoted in some of the films below, e.g. Dawn of the Dead, specifically state this is not the case. While zombie films generally fall into the horror genre, some cross over into other genres, such as comedy, science fiction, thriller, or romance. Distinct subgenres have evolved, such as the "zombie comedy", "romantic comedy with zombies" and "zombie apocalypse". Zombies are distinct from ghosts, ghouls, mummies, Frankenstein's monsters or vampires, so this list does not include films devoted to these types of undead.