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Coordinators: 1cy June 2cy Jan 3cy Jan adult Jan |
Ring-billed Gull delawarensis 1st cycle (2CY), May 06 2014, Chicago, IL. Picture: Amar Ayyash.The grey wing-coverts best regarded as from "post-juvenile moult". This moult has been extensive in this individual, including almost all visible wing-coverts in the resting bird (except the carpal edge) and post-juvenile moult included the upper tertials. Flight feathers worn and bleached as is common in Ring-billed Gull in spring.
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delawarensis Ring-billed Gull