More pics of Pacific Loon in winter plumage

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This appears to be an adult but there is some checkering pattern on it's back. Birds of North America online states that Basic Plumage "Worn from Nov to Mar. Acquired by complete Definitive Prebasic molt, beginning in Aug–Nov or later, with most feathers replaced by winter," So I guess it is not unusual for them to retain this portion of their Atlernate plumage this close to December? SeEtta

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