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Gulls & tern ID ? Taiwan

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Old Saturday 14th December 2013, 20:57   #1
Meerkat
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Gulls & tern ID ? Taiwan

Taken yesterday at Aogu wetland park (Taiwan)

Anyone can help me with the ID for this birds ?

thanks
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Old Saturday 14th December 2013, 21:01   #2
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Caspian Tern, Vega Gull (?) and Black-headed Gull for me.
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Old Saturday 14th December 2013, 22:35   #3
lou salomon
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i agree on caspian tern and black-headed gull. the 1st winter large gull to me looks more like a mongolian though. white head, weak window, advanced and somewhat bleached plumage, bicoloured bill - some of the hints towards this taxon, imo.
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Old Sunday 15th December 2013, 06:55   #4
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Or perhaps heuglini due to the dark inner primaries and greater coverts.

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Old Sunday 15th December 2013, 13:57   #5
chris butterworth
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Of the 3 regular 'Herring' Gulls wintering on the Sea of Japan coasts the dark greater secondary coverts and the rather 'collared' look to the sides of the neck / breast look better for 'taimyrensis' / Heuglin's.

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