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4cy Caspian Gulls
1: © Ruud Altenburg, 17-05-07. This bird is a good example of the problem ageing subadult Caspian Gulls. There is a large proportion of 'immature' wing coverts and a white mirror on P10 seems to be absent altogether. Still green 6P27 is a 4cy, ringed as pullus at Włocławek, Poland on 13-05-04 (as "Larus argentatus-complex").
2: © Ruud Altenburg, 21-05-03. The tail still shows signs of black markings, so this individual too probably should be aged as a 4cy. The contrast with the bird in 1 is obvious!
3: © Ruud Altenburg, 23-05-07.
4: © Ruud Altenburg, 23-05-07.
5: © Ruud Altenburg, 25-05-07.
8: © Ruud Altenburg, 25-05-07. Unfortunately the ring could not be read. An obviously long-legged bird!
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