Lesser Black-backed Gull graellsii NV4, April 2002 & 2004, Dintelhaven, Maasvlakte, the Netherlands (51.59N,04.02E).
An adult ringed, left green NV4.
top image: graellsii NV4, April 22 2002, Maasvlakte.
bottom: graellsii NV4, April 26 2004, Maasvlakte.
Breeding at the same location as previous years.