Coordinators:
Keith Mueller
Amar Ayyash
Mars Muusse
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1cy June
1cy July
1cy Aug
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2cy Jan
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adult Jan
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adult April
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Ring-billed Gull delawarensis 1st cycle (2CY), May 15 2014, Chicago, IL. Picture: Amar Ayyash.
Bird in complete moult: P1-P2 missing, P3-P10 old juvenile. Secondaries and rectrices juvenile. Note replaced inner coverts and upper tertials in the early stage of the complete moult.
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delawarensis Ring-billed Gull