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Large gull, Mai Po HK, 23rd Feb

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Old Monday 26th March 2018, 11:53   #1
kb57
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Large gull, Mai Po HK, 23rd Feb

Saw a few immature large gulls in HK last month, but didn't think I'd managed to get a photo - managed to extract these images (same bird possibly) from pics I took of a large flock of black-headed gulls - very heavily cropped so apologies for quality.
Presume 2cy? - Birds of HK and S China suggests Heuglin's or possibly mongolicus but I'd appreciate some advice - thanks!
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Old Tuesday 9th October 2018, 12:26   #2
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Bump...anyone?
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Old Wednesday 10th October 2018, 14:40   #3
andyadcock
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Can Black-tailed be ruled out?

Not sure Mongolian or Heuglin's would have that bill pattern at this age?
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Old Thursday 11th October 2018, 12:32   #4
MKinHK
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Definitely not Black-tailed.

Which LWHG is harder - and liable to be superseded by new taxonomy next week, and changed again the week after that!

Heuglin's is the most likely by dint of being the most abundant by at least one orgder of magnitude.

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