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Iceland or Glaucous Gull, Pennsylvania

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Old Wednesday 30th January 2019, 16:30   #1
jmepler
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Iceland or Glaucous Gull, Pennsylvania

There has been some discussion about the identity of the bird shown at this link.

It seems pretty obvious to me, but others disagree.

What's your opinion?
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Old Wednesday 30th January 2019, 16:40   #2
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Iceland Gull for me. Rounded head shape, and 'gentle' expression, long in wing.
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Old Wednesday 30th January 2019, 17:12   #3
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Iceland Gull for me. Rounded head shape, and 'gentle' expression, long in wing.
My impression too.
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Old Wednesday 30th January 2019, 17:24   #4
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for what it's worth (not that much) my feeling is glaucous. Bicoloured bill, small eye, primary extension beyond tertiaries not that big.

but, hopefully some of the gull experts on here can chip in.

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Old Wednesday 30th January 2019, 17:30   #5
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I usually don’t like to give an opinion on a gull with only one pic to go on. But this certainly looks like a Glaucous based on eye size, bill thickness and pattern, short primary projection and thick neck...
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Old Wednesday 30th January 2019, 18:04   #6
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It looks like a (small, female?) Glaucous to me also, for the reasons already stated.
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Old Wednesday 30th January 2019, 18:10   #7
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Well now, that was my thinking too (Glauc).

As an aside perhaps (a question I've been wanting to ask), has there ever been any evidence/suspicion of hybridising between the two?
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Old Wednesday 30th January 2019, 20:30   #8
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Glauc for me too - stout, pink-based bill; short primary extension.
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Old Wednesday 30th January 2019, 23:37   #9
Larry Sweetland
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Another vote for Glaucous
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Old Thursday 31st January 2019, 00:42   #10
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Another vote for Glaucous
And another one.
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Old Thursday 31st January 2019, 02:35   #11
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going by "jizz": Iceland gulls tend to look smooth, rounded, elegant, while Glaucous look harsh, awkward, angular. A bit like the difference between a Carrion Crow and a Rook or a falcon and a hawk/buzzard. While this one has a rounded head, it otherwise looks Glaucous-ish to me.

On hybridisation: Glaucous x Herring is a well-known hybrid, but I don't think I have ever heard of Iceland hybridising with any other species. Though an Iceland x Glaucous hybrid might be hard to definitively identify as such...
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Old Thursday 31st January 2019, 07:06   #12
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I thought Glaucous before I read the comments and for the reasons already given. Also, I would expect Iceland to show a less deep, more tapered bill. And (more of a question, this) shouldn't any Iceland with this two-toned bill pattern also have pale irides?
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Old Thursday 31st January 2019, 13:10   #13
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I thought Glaucous before I read the comments and for the reasons already given. Also, I would expect Iceland to show a less deep, more tapered bill. And (more of a question, this) shouldn't any Iceland with this two-toned bill pattern also have pale irides?
Nope, this pattern also occurs in juvenile/first winter glaucoides too.
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Old Friday 1st February 2019, 19:18   #14
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Thanks to everyone for their opinion. It appears that nearly everyone involved has been convinced that it is a Glaucous Gull.

I think that this is a smaller (likely female) bird may have lead to some of the trouble some where having.

The two-toned bills on Iceland Gulls that I have seen, both juvenile and second winter birds, have never been this well defined.
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