Coordinators:
Keith Mueller
Amar Ayyash
Mars Muusse
Index ORG
ring projects
PDF's
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
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3cy Dec
adult Jan
adult Feb
adult March
adult April
adult May
adult June
adult July
adult Aug
adult Sept
adult Oct
adult Nov
adult Dec |
Ring-billed Gull delawarensis 2nd cycle (3CY), February 13 2014, BP Whiting refinery, IN. Picture: Maarten van Kleinwee.
Maybe at fisrt glance adult-like, but lack of obvious white tips on outer primaries. Also, the mirror on P10 is often relatively small or absent in 2nd cycle.
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delawarensis Ring-billed Gull