Besides saints and apostles, the exteriors of Gothic churches were also decorated with sculptures of a variety of fabulous and frightening grotesques or monsters. These included the chimera, a mythical hybrid creature which usually had the body of a lion and the head of a goat, and the strix or stryge, a creature resembling an owl or bat, which was said to eat human flesh. The strix appeared in classical Roman literature; it was described by the Roman poet Ovid, who was widely read in the Middle Ages, as a large-headed bird with transfixed eyes, rapacious beak, and greyish white wings. They were part of the visual message for the illiterate worshippers, symbols of the evil and danger that threatened those who did not follow the teachings of the church.