Coordinators:
Keith Mueller
Amar Ayyash
Mars Muusse
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adult Jan
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Ring-billed Gull delawarensis 1st cycle (1CY), September 27 2012, Tinley Park, IL. Picture: Amar Ayyash.
See Amar's blog.
Advanced looking bird. All scaps replaced, upper tertial, inner GC, most MC and LLC and random many LC replaced as well for grey feathers.
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delawarensis Ring-billed Gull