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American Herring Gull, Larus smithsonianus


Age/Type Date Location Comments
1st CY September Delaware, USA Nearly completely juvenile
1st CY November Maryland, USA Extensively pale-barred tail
1st CY November Virginia, USA Entirely orange-yellow bill
1st CY November Virginia, USA Typical bird
1st CY December Virginia, USA Pale greater coverts and 2nd generation mantle/scapulars
1st CY December Virginia, USA Juvenile plumage
2nd CY January Virginia, USA Dark bird
2nd CY January Virginia, USA Pale greater coverts and upperparts
2nd CY January Virginia, USA 2 dark birds
2nd CY January Virginia, USA 3 more typical birds, one still juvenile plumage
2nd CY February Virginia, USA Pale, almost olive-colored bird
2nd CY February Virginia, USA Mostly juvenile, still fresh
2nd CY February Washington D.C. Worn bird
2nd CY February Washington D.C. 4 different birds
2nd CY February Washington D.C. Grey 2nd gen. upperparts 
2nd CY February Washington D.C. Plain grey 2nd generation upperparts
2nd CY March Maryland, USA  Selection of different birds
2nd CY March Maryland, USA Plain grey 2nd generation upperparts
2nd CY March Maryland, USA Dark grey head and new upperparts feathers

2nd CY

March Virginia, USA

Pale tertials

CY = Calendar Year