I normally err towards pale northern Herring, but this beauty on the north side of Shrewsbury this morning looked smooth, pale and Glaucy enough to be a Viking #lovegulls #shropshirebirding

I’d have misidentified that as a Glauc. What makes it a Viking? Black bill tip is a bit too smudgy and primaries a little too dusky for a Glauc I presume?