According to a version of the Saga of St. Olaf (Olaf II of Norway) the king encountered a margygr whose singing lulled voyagers to sleep causing them to drown and whose high-pitched shrieks drove men insane. Her physical appearance is described thus: "She has a head like a horse, with ears erect and distended nostrils, big green eyes and fearful jaws. She has shoulders like a horse and hands in front; but behind she resembles a serpent". This margygr was also said to be furry like a seal, and gray-colored.
According to a version of the Saga of St Olaf (Olaf II of Norway) the king encountered a margygr whose singing lulled voyagers to sleep causing them to drown and whose high-pitched shrieks drove men insane Her physical appearance is described thus "She has a head like a horse with ears erect and distended nostrils big green eyes and fearful jaws She has shoulders like a horse and hands in front; but behind she resembles a serpent" This margygr was also said to be furry like a seal and gray-colored