Ghosts

A ghost, originating from the words ghoisdo-s (Germanic Old Norse meaning rage), gast (Old English) or geist (as in Poltergeist) is the soul of a dead person or  animal, a disembodied spirit, usually as a vague, shadowy or evanescent form, as wandering among or haunting living persons. The idea of ghost states that our cryptid are not all they appear to be.