This Herring Gull was seen in Hanstholm Harbour on 30 December 2013. It has a primary pattern which reminds of what is seen in some birds labelled as hybrid hyperboreus x argentatus (Viking Gull), but as it lacks a clear influence from Glaucous Gull other than in the outer primaries, it is considered to be European Herring Gulls with reduced or aberrant pigmentation.
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Note the distinct thayeri pattern on P9 on the adult-type Herring Gull in the front
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