Black-headed Gull Chroicocephalus ridibundus(last update: |
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Below: First-calendar year Black-headed Gull with dark head markings, October 6, 2012, Grou, The Netherlands. Photos: Ruurd-Jelle van der Leij.First-calendar year Black-headed Gull with darker than usual head markings (compare with more standard looking first-calendar year in the background). |