Tail variations in Juvenile Herring Gulls

Monday 10 August 2015

The variation in tail patterns of Herring Gulls both argenteus and argentatus is unique to every bird, like fingerprints ...
Ranging from small terminal bands to near complete dark tails, some are fairly plain whilst others are boldly barred ...


















Patterns and marking are due to genetics but could some be caused by dietary deficiencies ...

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