I snapped the two birds below at Bay of Skaill this morning. One is clearly Kumlien's but the other one appeared to be an Iceland Gull, but then in flight its tail would surely make it Kumlien's????
Don't think anyone would argue with this as Kumlien's (3cy)
This one looks like Iceland (3cy) though
...but that's a tail bar isn't it? Kumlien's then?
The brute was slightly more straightforward
There were 10 Iceland (type) Gulls in the bay this morning, with two Glaucous, on the loch there were two more Glaucous.