This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Xecotcovach (Mayan)
Xecotcovach was one of four birds which played a significant role in the destruction of the first race of people created by the god of the wind, Hurakan. The creation myth says after the gods made the animals, earth, moon, sky, and sun, they created a race of people made of wood who were meant to appreciate the gods and see to the wellbeing of the animals.
This first attempt of humanity was a failure as the wooden people insulted the gods and abused the animals. Hurakan sent a great flood to drown the wooden people; he also sent Xecotcovach who tore out their eyes. Camulatz bit off the heads of the drowning; Catzbalam pecked away their flesh; and Tecumbalam broke their bones and sinews, and then ground their bodies into powder.