Larus fuscus fuscus 4cy female CS96 May 01 2008, Tara dump, Tampere, Finland. Pictures Hannu Koskinen.
CS96 has been ringed as pullus in Finland, on 09 July 2005 at Korpilahti, C Finland.
Very small mirror on P10 and hardly visible white tips to the outer primaries are indications for 4cy female.
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