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Snowy Showoff: Bill-vibrating behavior

I recently had the pleasure of attending the 39th Western Field OrnithologistsConference in San Diego, California. Among the wonderful places I birded was the San Dieguito River Estuary in Del Mar. Its banks and mud bars hosted a pleasing variety of shorebirds (Pacific Golden-Plover, anyone?), and landscaped properties bordering the river teemed with bird life. But my personal highlight of the…

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