Vampires

Vampires are supernatural creatures that have been encounterred by the Winchesters, Gordon, and other hunters. Little has been revealed by vampires, save that they can only be killed by beheading (so far). Blood from the dead can also be used to incapacitate them briefly. Vampires are immortal and do not age, and while sunlight can hurt them (John Winchested likened it to a really bad sunburn) it is non-lethal. Vampires are organized into nests, with eight to ten vampires residing in each. The younger members of the nest typically do the hunting for their elders, bring back humans to be fed upon for days or even weeks.

Although human blood is preffered, vampires can survive by ingesting the blood of animals, although one such vampire, Lenore, referrs to cow blood as 'disgusting'.