I guess it’s really just potential escapes muddying the water. If it can be assumed that most are of wild origin then yes, not a lot wrong with them. Records from North Africa, Canaries, S Europe, Low Countries, France, Britain etc. A species prone to wandering and short sea crossings not an issue…
…& prone to boarding ships, rigs etc. No different to a number of transatlantic species. Lots of records of snowy owls on container ships but never a question mark over their occurrence. I think there’s weight to the argument in favour of these (and not just because there’s one down the street 😜)
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