Notice the ticks on the Glaucous above. Virtually all of the birds carried these passengers - in fact we used the number and distribution of ticks to help distinguish between some of the more similar individuals. I've seen these ticks on white wingers in previous years.
Same Glaucous as above
A different bird
A different (rather dark) individual - this one appeared briefly at Peterhead
A pale (ish) bird from Fraserburgh
In the fish skip
Same bird as the image above
Two second winter birds were present at Peterhead
Same bird as above
The second individual - rather tatty
The tatty bird.
This beautiful ghostly Iceland Gull appeared at Fraserburgh on 7th; it is not quite fully adult
The same bird. Some light fawn stippling on the primary coverts and along the basal half of the outer webs of some of the outer primaries; the stippling faded out, leaving the outer parts of the primaries pure white.