At one time in all countries of Sardinia, it was believed that men had made malvaggi (crime) during the night could be turned into animals and they came around to announce the death.
Generally transformed in Oxen and bellowed three times, before the door of the predestined, to resume human form again at dawn... As such the Erchitu can be considered as a 'wereox'...
The Erchitos can free themselves from their torment only when they encounter someone brave and strong, capable of extinguishing the candles in one puff, or capable of cutting the horns on the head with one precise shot...
Resources:
See werewolf:
Post ImagE: http://bit.ly/1kFZt0T