I saw a minimum of 25 Iceland and 11 Glaucous Gulls today - I know AL counted more than me at Skaill (27), but at one point I managed 21 between the loch and the beach. I think there were at least 8 different Glaucous Gulls at Skaill. There was some evidence that birds were moving though south with birds at Marwick (4 Iceland) disappearing in that direction around 2 or so. However, a short sea watch at Pt of Buckquoy did not reveal any white winged gulls on the move there, there was just a single 3cy Glaucous looking miserable on the Palace beach. There were two Glaucous at Marwick as well.
I think this is Kumlein's
Very dark Glaucous Gull
WWGs on Skaill beach
Of the 21 birds I saw at Skaill I think two were Kumlein's but I may be wrong, I have limited field experience of this form (just one I think). The first initially appeared to be an adult, but when I saw it again on the beach, initially thinking it was a different bird, I realised it was not a full adult. The basal 50% of the bill was a murky, pinkish grey, the tip 50% straw yellow with an indistinct red spot. The eye was dark. There appeared to be very feint grey smudges in the primaries, very indistinct. This was a petite bird compared to many of the others present. I don't believe glaucoides can have this combination of bill, eye colour can it? The other bird was a 3cy and had some grey in the mantle, a dark tipped greenish bill, a dark eye and distinct brownish smudges in the primaries, across all primaries, again I don't think this is a combination that's ok for glaucoides but I'll be happy to be corrected. I did see the eyes well at fairly close range and viewed with the scope.
A fantastic spectacle at Skaill, just brilliant, if a little damp in the continuous rain today.