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Glaucous Gull, Larus hyperboreus

2nd Calendar Year, January 2005

 Salisbury Landfill, Maryland, USA

The primaries on this bird are slightly darker than the rest of the upperparts and the tertials also have muddy centers.  However otherwise It seemed a pretty classic Glaucous - very large, bigger than any smithsonianus around, and the bill looks good for Glaucous. Perhaps a dark bird originally and for some reason the primaries/tertials have faded the least, or maybe it has some Herring genes?  

Here is a comparison of head and bill profile of this bird with adult Great Black-back and American Herring.