All images were taken on 27 April 2015 in the gull colony of IJmuiden (Forteiland, see map), the Netherlands.
Larus argentatus argenteus
Green YBAH, female, >7 calendar years
Showing a hint of a pseudo-mirror on the underside of P10 in the left wing.
Green YBAK, male, >7 calendar years
Green YBBN, male, >7 calendar years
Lesser Black-backed gulls
Larus fuscus graellssi (Dutch intergrade)