Some random images of Great Black-backed Gulls and Herring Gulls taken at IJmuiden, the Netherlands on 15 and 16 February 2019.
Great Black-backed Gulls
A second-calendar year and an adult.
Male Green YBDS from our IJmuiden Forteiland project.
Female Green YBUK from our IJmuiden Forteiland project.
Second-caledar year Scandinavian Herring Gull,(L. a. argentatus). Note the lack of moult in mid-February.
Some unringed adults: