The Nukekubi are a type of Japanese supernatural creature or spirit (yōkai).
This kind of strange beings look normal human beings but when the night falls they use their ability to detach the head from the body to hunt human prey. His carnivore appetite drives them to fly long distances in search for fresh blood. It is said that they used to be extremely violent, sometimes biting their victims to death.
An evident weakness of the Nukekubi is related to the place where the body rests; If the body is found and moved away, the head cannot be reunited to it when the morning comes. There is a very popular short-story of Hellboy where he hides the Nukekubi’s bodies underwater and that way he prevents the heads to attach back and they explode in the sunrise – One of our favourites.