Wednesday, 1 September 2010

Lesser Black-backed Gull (Larus fuscus graellsii), ad, 1.9.2010, Aarhus Harbor

Putative Western Lesser Black-backed Gull (Larus fuscus graellsii). This individual was first seen few days ago in Aarhus Harbor (judged from the primary moult stage and some specific wear on tertials and the longest primaries).

Judged only on upper part colors we cannot safely dismiss an intergrade between intermedius and graellsii, but it is much paler than a classical Danish breeding intermedius.

Note hove the upperparts changes colour according to the light situation

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