In Virgil, Scylla, the daughter of Nisus, is confused with the sea-monster, the daughter of Phorcys.
According to Roscher (in his Lexikon der Mythologie), who identifies the ciris with the heron, the story of Nisus and Scylla (like these of Acdon, Procne, Philomela and Tereus) was invented to give an aetiological explanation of the characteristics of certain birds.
Sparrowhawk accipiter nisus Up to 3 females seen on the trip.
Barn swallows (Hirundo rustica) were hunted by a Sparrow hawk (Accipiter nisus).
In the legend of Nisus and Scylla there is a trace of the custom which was still observed in classical times in the sacrifice of animals.