查看完整版本: Vega Gull 西伯利亞銀鷗

Vega Gull 西伯利亞銀鷗

[img]http://images4.fotop.net/albums3/ThomasChan/Vega_Gull/mar_9_12_1.jpg[/img]

9/3/2012
Mai Po 米埔
Hasselblad CF500mm + APO1.4XE + 7D
ISO320 f11 1/100s

This is an interesting bird. The extensive head streaking does suggest Vega, but you'll notice it's noticeably grey in tone, rather than brown. While not at all diagnostic, it doesn't fit many Vega Gulls.

A more critical feature, however, is the progression of primary moult. It can be seen that (numbering outwards) P6, P7 and P8 are full grown, but P9 is not visible. Primary moult is, thus, still ongoing. Given the early March date, this means that this bird is not pure Vega Gull, or at least not an individual of the type seen in large numbers in Japan.

Do you have photographs that show the leg colour or upperwing pattern? It would be interesting to see these.

GeoffC

[quote]Original posted by [i]cgeoff[/i] at 16/03/2012 16:22 [url=http://www.hkbws.org.hk/BBS/redirect.php?goto=findpost&pid=47772&ptid=16026][img]http://www.hkbws.org.hk/BBS/images/common/back.gif[/img][/url]
This is an interesting bird. The extensive head streaking does suggest Vega, but you'll notice it's noticeably grey in tone, rather than brown. While not at all diagnostic, it doesn't fit many Vega Gu ... [/quote]

Hi Geoff,

  I have not get the photo of the leg. But I have seen the colour of the leg may be yellow.

Thomas.