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Are they juv. blacked-napped Terns?

fatchun

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1# A A A Post at 4/08/2010 20:23  Show author

Are they juv. blacked-napped Terns?

On the left hand side, there are two terns with darker wing color.
I am thinking if they are white-winged tern juv. or blacked-napped tern..
Thank you for any advice.

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HKBWS Vicky

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2# A A A Post at 5/08/2010 09:44  Show author
I think all of them are Black-naped Tern.

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fatchun

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3# A A A Post at 5/08/2010 18:50  Show author
thank you very much

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