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Are they Yellow-legged Gulls or Heuglin's Gulls

Are they Yellow-legged Gulls or Heuglin's Gulls

Would experienced birdwatchers please help to confirm the identity of these gulls?

Shanghai, 19.03.08









[ Last edited by wcherry at 24/06/2008 22:55 ]

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Many thanks for Dr. Cheung's reply.

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