Images of fifth-calendar year Herring Gull Green YBMD, seen in the gull colony of IJmuiden Forteiland, the Netherlands, 4 June 2017.
Myself and other gull lovers have been able to extensively photograph this gull since the year it was born. This has resulted in a great overview of the plumage development from juvenile to adult in an individual gull. See for a full overview gull-research.org.
Gulls to the Horizon 