Kunal-trow (also called king-trows) are a particular species of trow in the Shetlands.
Their humor was always morose and moribund, as they wandered lonely lands between dusk and dawn. There were no female kunal-trows; they instead married mortal women, who died after bearing the children of the king-trows. Since the Kunal-trows were monogamous for life, this was their only happiness.
- The Encyclopedia of Fairies by K.M.Briggs.