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Herring Gull (argenteus) Y.HBU 1CY, 2026, IJmuiden, the Netherlands. Picture: IJmuiden Ringing Team.Ringed as pullus in season 2026 at Forteiland, IJmuiden. Ringed by Fred Cottaar ringing team. below: Herring Gull (argenteus) Y.HBU 1CY, September 28 2026, IJmuiden, the Netherlands. Picture: Thijs Horst.
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