Lesser Black-backed Gull graellsii NLA 5.330.599 19CY, September 03 2015, IJmuiden, the Netherlands.
Continental graellsii from this population are also referred to as 'Dutch intergrade', upperparts between medium grey British graellsii and dark grey Scandinavian intermedius.
Ringed as pullus on June 24 1997, at IJmuiden, the Netherlands.
Local adult, probably female, with obvious black on bill.
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