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Old Thursday 22nd June 2017, 11:46   #1
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Location: Portland, Dorset
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Larus a. argenteus or L.a. argentatus?

Lou and others... comments welcome please.

Thank you.

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Old Tuesday 11th July 2017, 14:14   #2
Dean Nicholson
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Hi Keith,

Time of year, mantle tone and primary pattern all point to argenteus..... some intergrades could look similar i guess but certainly not difficult to find local argenteus Herring gulls breeding in Britain with similar primary pattern.

Cheers, Dean
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Old Tuesday 11th July 2017, 14:39   #3
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Probably argenteus, on location, p10 tip not completely white with a small black notch on inner web, p5 with a broken black band (argentatus would not have black on p5 or just a small and diffuse spot )
But it's not often possible to tell them apart. This case is borderline
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Old Monday 17th July 2017, 11:39   #4
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Thanks for your welcome comments guys.. I understand everything you say. I haven't noticed patterning quite like this on argenteus p5 before - hence my post to document it and learn more, particularly with respect to the 'intergrades'.
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