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Herring Gull (argenteus) Y.HRU 1CY, 2026, IJmuiden, the Netherlands. Picture: IJmuiden Ringing Team.Ringed as pullus in season 2026 at IJmuiden - Harbour (aanlegsteiger Sluisplein). Ringed by Fred Cottaar ringing team. below: Herring Gull (argenteus) Y.HRU 1CY, July 10 2026, IJmuiden, the Netherlands. Picture: Mars Muusse.With 3rd sibling, which remained unringed.
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