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[Hong Kong] ID please

ID please

At Sai Kung 19JUN.

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Gull-billed Tern.  Facial pattern, bill and width of wing fit well.

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Thank you very much HFCheung.  So it is a juvenile bird as the top of the head not completely black!
This bird was very active and flew around.

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It's a winter-plumaged adult, not a juvenile. Possibly a first-summer bird that will not breed this year.

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Thanks ajohn.

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