I just got an email from Dr Rob from the British Institute of Ornithology on the subject . "I think we can reasonably safely say it hasn't been a Cornish bird for at least 200 years and certainly not a common one.........." "Nightingales are fairly well known, certainly by reputation so I'm not sure the existence of a tune such as this can really be held up as evidence that they bred in the area." So it seems from the evidence that the song is based on the metaphor alone ,and that Cornish language enthusiasts have overstated their county's connection to the song .
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