Coordinators:
Keith Mueller
Amar Ayyash
Mars Muusse
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1cy June
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adult Jan
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Ring-billed Gull delawarensis 1st cycle (2CY), April 30 2014, Chicago, IL. Picture: Amar Ayyash.
Note dark iris. Flight feathers all juvenile. No tertials replaced in post-juvenile moult. Single wing-covertsgrey (like GC3), replaced last autumn.
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delawarensis Ring-billed Gull