"First-winter. Princeton Field Guide (Birds of Europe, Svensson) says ""many 1st-winters acquire second-generation inner wing coverts and tertials by October, much earlier than same age Herring Gull."" You can see the molt between the worn juvenile plumage below & the fresh first-winter coverts, which are lighter, above."
"First-winter. Princeton Field Guide (Birds of Europe, Svensson) says ""many 1st-winters acquire second-generation inner wing coverts and tertials by October, much earlier than same age Herring Gull."" You can see the molt between the worn juvenile plumage below & the fresh first-winter coverts, which are lighter, above."