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Could it be a hybrid Common Gull x Ring-billed Gull?

Posted: Thu Feb 28, 2013 7:26 pm
by Spinus
Hi
I saw this gull few days ago. I'm wondering is it possible to be a hybrid with delawarensis. The eye is extreme pale, mirror on P9 looks like in RBG and bill is quite strong with nice black band.

Adam

Re: Could it be a hybrid Common Gull x Ring-billed Gull?

Posted: Thu Feb 28, 2013 11:53 pm
by adriaens
Rather than a hybrid, this is far more likely a Russian Common Gull (heinei).