The strix, in the mythology of classical antiquity, was a bird of ill omen, the product of metamorphosis, that fed on human flesh and blood. It also referred to witches and related malevolent folkloric beings.

Cardea or Carda was the ancient Roman goddess of the hinge, Roman doors being hung on pivot hinges. The Augustan poet Ovid conflates her with another archaic goddess named Carna, whose festival was celebrated on the Kalends of June and for whom he gives the alternative name Cranê or Cranea, a nymph. Ovid's conflation of the goddesses is likely to have been his poetic invention, but it has also been conjectured that Carna was a contracted form of Cardina, and at minimum Ovid was observing that their traditions were congruent.