Alvan Buckley found this bird at St. John’s 4 days ago (September 16th 2014) and emailed the next day. Apologies for not getting it up earlier ( of living at Flamborough!). This bird looks right on the money for the East Asian Kamchatka Gull. Here’s Alvan’s description:
Remarkably, it was standing right next to an adult Yellow-legged Gull (see last photo).
The mantle colour was very similar, if not the same as the YLGU.
Bill was notably thinner without any obvious markings or widening near the end (almost Mew Gull like).
Eye was dark!
Leg colour was definitely more yellow than the YLGU. In fact I would say that the YLGU legs were more orange in colour.
Legs were short and thin, could barely see above the tarsus.
Head streaking was slightly more dense on top of the head, but was present along the neck too and the streaking was generally smudgy in appearance.
Body was noticeably slimmer and smaller than the YLGU and HERGs.
From the in flight shots it appears that p9 and p10 are missing/growing in – so it is advanced in its primary molt for an adult at this time of year. New P8 is part grown.
and my response:
sorry for slow response- very busy as just moved house and lots migration going on outside!
This look remarkable and looks pretty much spot on for a Kamchatka Gull (as you hinted)- no problem with size- you get big ones. The dark iris was little disconcerting as they often have paler iris but think its ok.
I checked with top gull man Chris Gibbins and his reaction was exactly the same- look great for Kamchatka Gull.