This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Headless Mule (Brazilian)
The myth is believed to have a medieval origin, and to have been brought to Brazil in the early colonial era (16th century or later). The tale is most popular in the states of Goias, Minas Gerais and Mato Grosso, but is well known throughout the country. Similar myths (the Muladona and the Almamula) occur in the surrounding Hispanic countries.
The Mule's appearance varies greatly from region to region. Its color is most commonly given as brown, sometimes as black. It has silver (or iron) horseshoes that produce a hideous trotting, louder than any horse is capable of producing. Despite being headless, the Mule still neighs (usually very loud), and sometimes it moans like a crying woman. It also has a bridle tied to its non-existent mouth, and spews fire through its non-existent nostrils.