Of note, this is the first record for the region, eg both Scilly and Devon have yet to record a North American sparrow. The species breeds in Canada and new England and migrates south in the autumn to spend its' winter in southern and eastern USA. There are over thirty records in the UK alone but the majority eminate from major ports eg Felixstow and Southampton. The assumption is that the species has hitched a lift on the grain ships and been quite content to feed up and stay on board until nearby land is in sight. Given that there are no major ports in Cornwall, one can only wonder exactly where this individual came from. Any thoughts on the subject are welcome.
John Chapple's excellent video of the bird, including that fantastic mournful song, can be viewed here