This beautiful fourth-calendar year Iceland Gull Larus glaucoides was discovered in Utrecht, the Netherlands on 5 March 2015.
I was able to visit it today (March 14) and was rewarded with good views, albeit in rather dark-ish light.
Iceland Gull is a regular winter visitor to the Netherlands, but these are almost always first-years; sub-adults or adults are hardly ever seen here.
Gulls to the Horizon 