According to Shona (African) myth, when the sun sets and darkness falls on the land, evil spirits of witchcraft invade and posess innocent souls in their sleep. The possessed, who do not bother to get dressed, wake up and mount awaiting hyenas (transportation) and head off to the graveyard to snack on the dead. They have snakes as charms and advisors of evil. Owls are messengers and scouts to avoid being discovered.
After eating their fill, the witches make their rounds casting terrible spells on those who have insulted or wronged them, those they are jealous of and anyone they do not particularly like.