an informal birding record
tarsiger.co.uk
 
Great Black-backed Gull
 

Larus marinus

Above: 1st winter/2nd calendar year (Teeside, 04 January 2009)

Dusky underside and pale fringed primaries point to Glaucous Gull (L. hyperboreus) somewhere in the recent lineage.

 

 

 

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