Lesser Black-backed Gull graellsii NV sub-adult, May 29 2015, Katwijk, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull, ringed as rooftop breeding sub-adult in municipality Katwijk. Ringed by ringing team Roland-Jan Buijs, see BLOG BUIJS (in Dutch).
Black: P2-P10. Mirror: P10. PMS: 0. Small mirror, large dark centres on greater primary coverts indicate 5CY bird, or even advanced 4CY.
Orbital: red. RUM: yes. BOM: U. Speckling: 1-5%.
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