A mermaid  is a legendary aquatic creature with the head and torso of human female and the tail of a fish. The male version of a mermaid is called a merman; and the unisex name is merfolk. Various creatures from different cultures throughout the world have similar figures. They were known to sing sailors to their deaths, like the Siren, or squeeze the life out of drowning men, while trying to rescue them.
This information was taked from Wikipedia, I reworded it some, but not much.
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