In The Demon-Haunted World, astronomer Carl Sagan pointed out that the alien abduction experience is remarkably similar to tales of demon abduction common throughout history: "...most of the central elements of the alien abduction account are present, including sexually obsessive non-humans who live in the sky, walk through walls, communicate telepathically, and perform breeding experiments on the human species" (Sagan 1996 124)
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Succubus: In folklore traced back to medieval legend, a succubus is a female demon or supernatural entity that appears in dreams, who takes the form of a human woman in order to seduce men, usually through sexual intercourse. The male counterpart is the incubus. Religious traditions hold that repeated intercourse with a succubus may result in the deterioration of health or even death.
A Kappa is a dwarf-like water demon of Japan that resemble shrivelled old-men, with webbed hands and feet, sporting a tortoise shell. An origin for the demons could be they are the ghosts of drowned souls. Any pond or river may have one. They possess immense strength and can easily overpower a human. Although the source of this power comes from the stored water within the dish on their head.