an informal birding record
tarsiger.co.uk
 
Large dark-backed Gull
 

Larus fuscus graellsii/marinus?

Above: Adult (Essex, 26 February 2011)

This huge individual was Great Black-backed sized, with a stout hatchet bill to match. At the time, it didn't really suggest Heuglin's, with thoughts being more around an outsized Lesser Black-backed (graellsii) or perhaps even a Great Black-backed (marinus) hybrid.

 

 

 

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