5CY Herring Gull YCKL with sub-adult plumage – 20210412
Tag Archives: larus argentatus 4cy
Visits to the gull colony of IJmuiden May – July 2019
4cy European Herring Gull Green YCDZ – May/June 2019
Images of European Herring Gull Green YBXB – 2015 and 2018
Herring Gulls at Terschelling – November 2017
Development of bill colouration in 4CY Herring Gull Green YCAX – 2016
5CY European Herring Gull Green YBPS with sub-adult features (incl. tertials) – 20150622
European Herring Gull Green YBDS as 2CY, 3CY and 4CY
4cy European Herring Gull Green Y.BPS – 20140602
Tertial spots in sub-adult and adult gulls
Gulls to the Horizon 