Gulls are a tricky bunch, defying easy identification.
It’s something to do with the perfect storm generated by a three-year cycle to maturity, different markings in each of those years for each species, and what I call “marking overlap,” in which a given year of one species looks like another year of another, if you see what I mean.
Anyway. Very complicated and, after all, anyone other than a birder sees just a seagull, and wonders what all the fuss is about.
My skill level in the arcane art of gull identification is best described as pre-beginner, so I take my fun from other aspects of the interaction. Like making up captions. Certainly not from getting detail in those white feathers . . .