5CY Lesser Black-backed Gull Green YBXJ with sub-adult plumage – 20190506

Be careful ageing those sub-adult Lesser Black-backed Gulls.

Green YBXJ from our IJmuiden Forteiland project in the Netherlands is now in its fifth calendar year but is still showing much black in its tail (even more than a 4th-calendar year would have).

IJmuiden Forteiland, the Netherlands, 6 May 2019.

Click for a larger image.

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