dark-grey backed gull id needed

Spinus
Posts:15
Joined:Wed Jan 27, 2010 11:29 pm
dark-grey backed gull id needed

Post by Spinus » Fri Dec 16, 2011 9:45 pm

This confusing gull was observed in harbor in northern Poland. Some features suggests Slaty-baked gull but other exclusive..
Could it be an abberant GBBG or hybrid with HG?
Please help
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