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請問臉上多兩條黃線有物分別

HFCheung

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1# A A A Post at 22/11/2011 15:04  Show all
成鳥發情時期的裝飾，主要在夏天出現。

張浩輝

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HFCheung

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2# A A A Post at 28/11/2011 13:47  Show all
Yes.  Same for male and female.

The length of the bill can be used to distinguish male to female.  However, this is not easy at all.  There may be other methods as well.  We need careful birdwatchers or photographers to work on problems like this.

HF Cheung

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