Mermaid
Medieval sirens as mermaids

The siren's part-fish appearance became increasingly popular during the Middle Ages. The traits of the classical sirens, such as using their beautiful song as a lure as told by Homer, have often been transferred to mermaids.

These change of the medieval siren from bird to fish were thought by some to be the influence of Teutonic myth, later expounded in literary legends of Lorelei and Undine; though a dissenting comment is that parallels are not limited to Teutonic culture.
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