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人造衛星追蹤黑臉琵鷺

How old is S21?  I thought he/she was ringed last year when he/she was hatched.  If he/she were only 1 year old, then it should not breed this year.  How non-breeding immatures spend their summer is always a question on my mind.  I will be very happy to learn from this bird.

HF Cheung

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去年冬天在香港的S21到了上海之後怎样?是不是整个夏天都在上海?

张浩辉

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