Thread
Print

請問臉上多兩條黃線有物分別

成鳥發情時期的裝飾,主要在夏天出現。

張浩輝

TOP

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

TOP

Thread