A changeling, also historically referred to as an auf or oaf, is a human-like creature found throughout much of European folklore. According to folklore, a changeling was a substitute left by a supernatural being when kidnapping a human being. Although sometimes it was a "stock" (a piece of wood made magically to resemble the kidnapped human), more often the changeling was a supernatural being made magically to look like the kidnapped human. Supernatural beings blamed for stealing children included fairies, demons, trolls, nereids and many others. Usually, the kidnapped human was a child; but there were cases, particularly in Scandinavia and Ireland, where adults were taken. Some modern scholars have argued these stories of replaced children originated as folklore explanations for autism or other developmental conditions.
" UP the airy mountain, Down the rushy glen, We daren't go a-hunting For fear of little men;
They stole little Bridget For seven years long; When she came down again Her friends were all gone. They took her lightly back, Between the night and morrow, They thought that she was fast asleep, But she was dead with sorrow. They have kept her ever since Deep within the lake, On a bed of flag-leaves, Watching till she wake."
