This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Huaychivo (Mayan)
The Huay Chivo is a legendary Maya beast. It is a half-man, half-beast creature, with burning red eyes, and is specific to the Yucatan Peninsula. It is reputed to be an evil sorcerer who can transform himself into a supernatural animal, usually a goat, dog or deer, in order to prey upon livestock. In recent times, it has become associated with the chupacabras.
The Huay Chivo is specific to the southeastern Mexican states of Yucatan, Campeche and Quintana Roo. Alleged Huay Chivo activity is sporadically reported in the regional press. Local Maya near the town of Valladolid, in Yucatan, believe the Huay Chivo is an evil sorcerer that is capable of transforming into a goat to do mischief and eat livestock.