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Herring Gull Larus argentatus

Variation in timing of acquisition of white-head


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Pair of Herring Gulls with differing onset date of white head

A. R. Dean

The date by which Herring Gulls lose their winter head-streaking can vary quite markedly. The two gulls in the above image are a presumed pair, as they were long-term companions frequenting a particular site for several months during the winter of 2014/2015 and subsequent winters. By late January, one individual had acquired a very white head yet the other still retained copious head streaking.


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