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Iceland-Herring-Glaucous in order?

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1 hour ago, Hasan said:

All are 4 year gulls so not Ring-billed. I'm assuming all are in the G-wing/Western complex

I think anything other than Herring for a 4 year gull at this location (just west of Ottawa) and time would be extremely rare.

For my own education can someone explain what features pinpoint these as 4 year gulls (I was also leaning to juvenile/immature Ring-billed partly because of bill size).

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