Images taken during a visit to the gull colony of IJmuiden Forteiland, the Netherlands, on April 8, 2019, as part of our research project.
Shown are European Herring Gulls and Lesser Black-backed Gulls.
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European Herring Gulls
(With partner YCHM.)
Partner of YBAK.
With pseudo-mirror on P9 in right wing and thayeri-pattern on P9 in left wing.
Female YCJS with male YCNW
With partner YBPT.
Male YCNK with female YCAH
With pseudo-mirrors on P9.
Lesser Black-backed Gulls
Female Blue 322
Ringed in the UK but breeding in IJmuiden.
Ringed in Zaandam, the Netherlands, but breeding in IJmuiden.
Ringed in Rotterdam, Maasvlakte, but seen frequently in the colony.
Female Black/Blue YF
Ringed in Rotterdam, Botlek, but seen frequently in the colony.
Male White N0LV
Ringed in Malaga, Spain, but breeding in IJmuiden.