A deadly creature, half human, half bird or fish

Kongelige Bibliotek, Gl. kgl. S. 3466 8º, Folio 37r
Siren: see an older post with an image of a mosaic at the Bardo Museum, Tunis. This one just had to be added. The artist has solved the problem of whether a siren should have the lower body of a bird or a fish by giving this siren bird's feet and a fish tail. The text says the siren "has the make of a woman down to the waist, and the feet of a falcon, and the tail of a fish."