Gull Research Organisation

American Herring Gull (smithsonianus)

(last update: October 30, 2015)

Coordinators:
Amar Ayyash (US)
Bruce Mactavish (Canada)
Dave Brown (Canada)
Mars Muusse (Netherlands)

smith 1cy August
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smith 1cy December

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American Herring Gull (smithsonianus) adult, October 12 2015, Lake County, Illinois. Picture: Amar Ayyash.

Adult type Herring with retained P10. Note how the "white" mirrors have deteriorated more than the "black" regions of the feathers. White pigment is not as durable as black.