delawarensis Ring-billed Gull

(last update: 10-03-2014 )

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

adult Jan
adult Feb
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adult June
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adult Aug
adult Sept
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adult Nov
adult Dec

Ring-billed Gull delawarensis X2M adult, December 03 2014, East 55th Street Marina - Cleveland, OH. Picture: Chuck Slusarczyk.

Blue X2M and metal Fed band 0954-20818, banded as breeding sub-adult on May 07 2012 at Île Deslauriers, Varennes, QC. This marking program is conducted by the Université du Québec à Montréal (UQAM) as part of a research project on movements and population dynamics of Ring-billed Gulls breeding in southern Quebec. For more details, you can visit our web site here ( If you find one banded bird, please report it here.

Ringed as breeding sub-adult, which probably means 2nd cycle (3CY) bird in 2012, and 4th cycle (4CY) by December 2014. Birds of this age group (young adults) resemble the full adult plumage in all respects (it remains to be seen if a larger reference group of these birds may point to some differences, therefore these are valuable observations).