Just does not follow typical herring patterns, like there are any?? Very similar photo of suspected Euro/vega Herring here: http://larusology.blogspot.com/2009/12/possible-european-herring-gull.html?showComment=1300547731418#c6977664528765821293and here from galway: http://morgithology.blogspot.com/2011/01/second-winter-herring-gulls.html But it is so difficult to determine. One thing that does bother me with this gull if argenteus or argentatus is the dark uniform coloring on the under sides, although the undertail coverts do seem finely streaked, unlike "typical" smithsonianus.