This post illustrates some of the variability in 1w Herrings that it is possible to see in a single day in NE Scotland. We have a mix of argentatus and argenteus at this time of year, with the latter breeding locally. Shown above is a rather pale bird, with a very white ground colour to the tail
A beautiful fresh looking bird that has retained all but a few first generation scapulars.
It is not too unusual to see bird with such pale primaries.
A paler-end and rather contrasting underwing.
A very dark and uniform underwing. I had (perhaps foolishly) hoped that there might be some consistent differences in the underwing between Herring and Vega Gulls of this age, but the variability of the former, as illustrated by these birds, rather limits the value of any 'average' differences.