Black-headed Gull White E50J with black spot on P4 – 20150208

Image of a 3rd-calendar year Black-headed Gull Chroicocephalus ridibundus with a black mark on the outer web of P4 (not a common occurance in my experience). It was caught and ringed as White E50J in Leiden, the Netherlands on 8 Februari 2015.

W-E50J-20150208-2

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