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Pls help to id Terns

HFCheung

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1# A A A Post at 2/07/2010 19:51  Show all
To help the separation of Common Tern versus Roseate Tern, Common Tern has a darker back and shows a clear paler rump.

Common Tern, 28 May 2010, Xinjiang

HF Cheung

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