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Topic: 咀色 Bill Colours of Roseate Tern (Read 531 times) |
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pan
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咀色 Bill Colours of Roseate Tern
« on: May 16th, 2005, 11:00am » |
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好開心又可以見到佢地d 靚靚相, 希望佢地今年生多幾"藪" 
對燕鷗的咀色有d 好奇。 
以粉紅燕鷗為例:
香港見到的粉紅燕鷗, 有時黑咀, 有時紅咀
( 唔知有冇人試過同一時間紅黑都見到)
係咩因素影響佢地ge 咀色?繁殖期 同 非繁殖期之分?
or 因為佢地來自唔同鄉下, 所以唔同?
換句話說香港見到的粉紅燕鷗, 來自好幾多個地方? 
thx  ~等我考埋個試,就第一時間去探下佢地先~
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| « Last Edit: May 17th, 2005, 10:59pm by Tern Group » |
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Hendrix
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Re: 咀色
« Reply #1 on: May 16th, 2005, 11:32am » |
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what I got 2 years ago, some is all red, some is partly red/black.
is a transition progess ?
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