Why does Judaism believe in דולפנין Mermaids?
Rashi on Bekhorot 8a:1:1
The Dulfanin reproduce with people - if a person lies with one of them, they can produce offspring. ( ה"ג הדולפנין פרים ורבים מבני אדם - שאם בא אדם עליהם מתעברות הימנו )
Rashi on Bekhorot 8a:1:2
Sons of the sea - there are fish in the sea that are half in the form of a man and half in the form of a fish. Sirene in old French. ( בני ימא - דגים יש בים שחציין צורת אדם וחציין צורת דג ובלע"ז שריינ"א )
Ramban on Leviticus 11:10:1
In my view, however, “creature that creeps [sheretz]” includes the fish swimming in water, because the connotation of shritza is movement, and “any living creature” refers to the sea animals that walk on their feet like the beasts of the field. All of them have one law. The Midrash in Toras Kohanim, however, says: “‘Living’ — this refers to the beasts of the sea, ‘creature’ — this includes the mermaid.
[https://www.sefaria.org/sheets/206651?lang=bi]
- The concept of a Mermaid seems similar to the Philistine false idol Dagon.
- Why would a false mythological being be accepted as a real sea-creature by Rashi & Ramban?
- Does Judaism still support Mermaids are real?