delawarensis Ring-billed Gull

(last update: 10-03-2014 )

Coordinators:
Keith Mueller
Amar Ayyash
Mars Muusse

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1cy June
1cy July
1cy Aug
1cy Sept
1cy Oct
1cy Nov
1cy Dec

2cy Jan
2cy Feb
2cy March
2cy April
2cy May
2cy June
2cy July
2cy Aug
2cy Sept
2cy Oct
2cy Nov
2cy Dec

3cy Jan
3cy Feb
3cy March
3cy April
3cy May
3cy June
3cy July
3cy Aug
3cy Sept
3cy Oct
3cy Nov
3cy Dec

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adult June
adult July
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adult Sept
adult Oct
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adult Dec

Ring-billed Gull delawarensis 1st cycle (2CY), May 15 2014, Chicago, IL. Picture: Amar Ayyash.

Note dark iris, dark secondaries. Note the gray patch on the lesser upperwing coverts, which may indicate formative feathers grown during the first calendar year. Bird now in complete moult: P1-P3 missing, P4-P10 old. Note replaced P5 for 2nd gen primary in left wing, but not in right wing (probably replaced after 'accidental loss of the feather').