--History-- Usually found in brazilian folklore, the headless mule is described as having a large horse body with no head. Fire somtimes takes the place of this head and the beast is said to only travel at night. Its normal form is a beautiful woman that turns into a violent beast at night usually because of some heinous crime that the woman performed. Killing her husband to be with a priest or murdering her children are the most common ones. Variations of the legened exist based on demographics.
--Sources-- http://everything2.com/title/Mythical+Brazilian+creatures