Black-headed Gull Chroicocephalus ridibundus
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Moderators:
Tim Audenaert
Maarten van Kleinwee
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June 13, 2009, Starrevaart, Leidschendam, The Netherlands(52.10N 04.43E). Photo: Maarten van Kleinwee.
Black-headed Gull moulting from juvenile to first-winter (formative) plumage. Some of the scapulars, middle and outer wing coverts have been replaced by second-generation gray feathers.
