This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Mandi (Medieval bestiaries)
The Mandi, according to Pliny the Elder, are a short-lived people from India. Pliny equates the Mandi, named by Cleitarchus and Megasthenes, whose women can bear children in their seventh year and who become old at forty, with the Macrobii, whose women only have children once in their lives.