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Slender-billed Gull?

Hi Jes, I think this is also a Black-headed Gull with dirty plumage,,,,
As shown in the Photographic guide of HONG KONG,,,slender-billed Gull will have a paler marks behind eyes,,,,
the photo you take show a strong and dark mark behind the eyes,,,,,
Correct me if I'm wrong,,,,!!^^

                             JOHN

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