Black-headed Gull Chroicocephalus ridibundus
(last update:
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Tim Audenaert
Maarten van Kleinwee
BHG 1cy May
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Below: First-calendar year Black-headed Gull, Helsinki ST-247931, December 17, 2006, Amsterdam, The Netherlands (52.167N, 4.528E).
First-calendar year Black-headed Gull in first-winter (formative) plumage. During the post-juvenile moult, all feathers have been replaced except those on the wings and in the tail. The body and head are now completely white, leaving a head pattern similar to adults (with a black ear spot and faint bars from ear to ear and eye to eye across the head). The legs are orange and the bill is orange with a white tip.
(Ringing date: June 9, 2006, Hyvinkaa, Uusimaa, Finland, 6038.00N, 2459.00E, age: pullus.)
