A very popular modern subgenre consists of stories that treat werewolves as separate race or species (either science fictional or magical) or as persons using magic in order to deliberately transform into wolves at will. Such current-day werewolf fiction almost exclusively involves lycanthropy being either a hereditary condition or being transmitted like a disease by the bite of another werewolf. The form a werewolf takes is not always an ordinary wolf, but is often anthropomorphic or may be otherwise larger and more powerful than an ordinary wolf. Sometimes the beast form of the werewolf will have some physical characteristics borrowed from an animal species other than the wolf, as can be seen in the boar-like werewolf of the film "Wild Country" (2005). Many modern werewolves are also supposedly immune to damage caused by ordinary weapons, being vulnerable only to silver objects (usually a bullet or blade). This negative reaction to silver is sometimes so strong that the mere touch of the metal on a werewolf's skin will cause burns.