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Coordinators: 1cy June 2cy Jan 3cy Jan adult Jan |
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 note black in tail and tertial, and 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