From the Pad of Definitions
Folkloric creatures, thought to be the re-animated corpses of human beings and said to live on human or animal blood. They often have unnatural powers and the ability to physically transform.
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The vampires in Supernatural are not killed with a stake, but must be decapitated. Sun is not directly harmful but they do not stand directly under the rays and sleep during the day. They are affected or slowed with Dead Man's Blood.
Vampires are rare because they have been hunted intensively. They live in packs and mate for life.
Neige 22:08, 12 September 2006 (PDT)