Sorcerer, transfigure by enchantment. Chivo brujo would be in Spanish the term with which the population of Yucatan refers to the central character of a legend that is part of the myths and magical-fantastic beliefs of the Mayan communities of the peninsula of Yucatan.
He is a black entity, with huge horns and very bright eyes. His goal is to scare people with his spooky appearance. His custom is to violently charge those who cross his path when night falls.
The popular idea is that there are demonized people who are capable of becoming goats to frighten and pressure the population in search of some specific purpose, usually malevolent. The oral tradition of the towns in Yucatan makes these supernatural beings characters in stories of all stripes, involving the local people and referring to events that concern the community itself. It is common for the way goat to make an act of recurrent presence in the towns of the geography of the Yucatan peninsula