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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
|