Scylla is described by Circe as an evil creature with 12 large feet and six heads on long necks, with each head containing three rows of razor-sharp teeth. According to Circe, Scylla lives in a den where she makes noises described as “a newborn whelps cry”. Another sea monster is called Charybdis. According to Circe, this creature comes up from the water and makes its attack. Scylla seems to be one of the strongest entities in the book.