GREAT BLACK-BACKED GULL Larus marinus

Juvenile and first-year

1. First-basic birds, Indian River Inlet, Delaware, USA, December 29, 2000 (GBBG_01 - GBBG_03)

Adult

1. Adults, Indian River Inlet, Delaware, USA, December 29, 2000 (GBBG_04 - GBBG_05)

 

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