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.