The Siren are said to be the oldest of the Merpeople, and their human half, the most human in appearance.1 In more traditional folklore, there seems to have been a transition over the centuries from a view of the Sirens as being birds with the heads of women, to being half birds, to being half fish.2
Harry Potter Wiki “Siren” Last Edited: 2021-08-03. Last Viewed: 2021-11-11.↩︎
Wikipedia “Siren_(mythology)” Last Edited: 2021-11-05. Last Viewed: 2021-11-11.↩︎