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Subject: Sexing Roseate Tern? 如何分辨粉紅燕鷗的性別？ [Print This Page]

Author: HFCheung Time: 8/08/2008 17:14 Subject: Sexing Roseate Tern? 如何分辨粉紅燕鷗的性別？

I have read from the book "Terns of Europe and North America, by Klaus Malling Olsne and Hans Larsson" that measurement of tail fork are different on male and female of Roseate Tern. The actual numbers for birds in the Caribbean (race dougallii) are:

Adult male: 80-136 mm, n=50
Adult female: 65-119 mm, n=29
Juvenile: 35-70 mm, n=11

Here is some photo taken in HK (presumably race gracilis from Australia).
A short-tail adult (likely female)

A long-tailed adult (likely male)

Another long-tailed adult

Photo are taken on 19 July 2008 at Tap Mun.
Thank to a member for pointing out the typing mistakes.

HF Cheung

[ Last edited by HFCheung at 13/08/2008 22:36 ]

Image Attachment: IMG_6099Q.jpg (8/08/2008 17:14, 53.37 KB) / Download count 397
http://hkbws.org.hk/BBS/attachment.php?aid=1937

Image Attachment: IMG_6207Q.jpg (8/08/2008 17:14, 38.84 KB) / Download count 421
http://hkbws.org.hk/BBS/attachment.php?aid=1938

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http://hkbws.org.hk/BBS/attachment.php?aid=1939

Author: BWA Time: 8/08/2008 22:08

爸爸來自澳洲？ So papa is from Australia?

（攝於 Taken on 27/7/08 刧後餘生 The last Surviving Family in southern waters ）

Author: BWA Time: 8/08/2008 22:29

不過這對的尾羽長度卻差不多。
But the different is not that big in this pair

21/6/08 南部水域 Southern Waters

Author: gary Time: 9/08/2008 09:11

Another pair is true with the assumption.
http://www.hkbws.org.hk/BBS/viewthread.php?tid=5441&extra=page%3D1

Gary

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