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        Discussion Area 討論區 >> Photo Gallery 相片分享 I >>  Yellow-legged Gull &nbsp;(mongolicus)
        
(Message started by: John Holmes on Jan 17^th, 2006, 11:20pm)

Title: Yellow-legged Gull  (mongolicus)
Post by John Holmes on Jan 17^th, 2006, 11:20pm

http://www.hkbws.org.hk/fileServer/PhotoG/jemi/jjh/NSWgull1-01.jpg
Yellow-legged Gull Larus cachinnans (mongolicus)
NSW
16/01/2006
20D EF600/4L + EF1.4x
Evaluative @ 0, ISO 400, 1/1000s, f/5.6

http://www.hkbws.org.hk/fileServer/PhotoG/jemi/jjh/NSWgull2-01.jpg
Yellow-legged Gull Larus cachinnans (mongolicus)
NSW
16/01/2006
20D EF600/4L + EF1.4x
Evaluative @ 0, ISO 400, 1/1000s, f/5.6

http://www.hkbws.org.hk/fileServer/PhotoG/jemi/jjh/NSWgull3-01.jpg
Yellow-legged Gull Larus cachinnans (mongolicus)
NSW
16/01/2006
20D EF600/4L + EF1.4x
Evaluative @ 0, ISO 400, 1/1250s, f/5.6

http://www.hkbws.org.hk/fileServer/PhotoG/jemi/jjh/NSWgull4-01.jpg

Yellow-legged Gull Larus cachinnans (mongolicus)
NSW
16/01/2006
20D EF600/4L + EF1.4x
Evaluative @ 0, ISO 400, 1/1250s, f/5.6
 
Four pictures of the same individual.  In the latter two bill and leg colour are obscured by mud.  There were no other large gulls around for comparison.  

Based on the pale grey mantle, light head streaking, white mirrors in dark wing tips, and pinkish legs, I think this is a "mongolicus".  

However, I am ready to be corrected!

Title: Re: Yellow-legged Gull (mongolicus)
Post by KK Hui on Jan 18^th, 2006, 8:41am

on 01/17/06 at 23:20:55, John Holmes wrote:

[img] ... Based on the pale grey mantle, light head streaking, white mirrors in dark wing tips, and pinkish legs, I think this is a "mongolicus" ...

Some nice shots here, John!
I'd be tempted to just call it 'Herring Gull' ... ;)

KK Hui FRPS
www.geocities.com/kkhui_001

Title: Re: Yellow-legged Gull (mongolicus)
Post by gjcarey on Jan 18^th, 2006, 4:10pm

As John says, it's a Yellow-legged Gull Larus (cachinnans) mongolicus.

In addition to the pale upperparts, the following are important features:

1. large white mirror near the tip of the p10, the outermost primary
2. extensive black on the wing tip, reaching toward the primary coverts and also including p4 and possibly p3
3. dull pinkish legs (despite the English name used, Chinese birds never seem to have truly yellow legs)
4. completed primary moult: p10, the outermost, is fully grown. Heuglin's Gull at this time of year will still have the outer few primaries yet to grow fully.

Geoff