kc3018 1/02/2015 13:00
Slaty-backed Gull ?
2015.01.24
Nam Sang Wai
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Thz for your help.
cgeoff 1/02/2015 21:30
The narrow tail band and fairly clear-cut, obviously pale inner primaries and pale bill base identify this bird as Yellow-legged Gull.
GeoffC
badesc 1/02/2015 23:44
[quote]Original posted by [i]cgeoff[/i] at 1/02/2015 21:30 [url=http://www.hkbws.org.hk/BBS/redirect.php?goto=findpost&pid=68484&ptid=22720][img]http://www.hkbws.org.hk/BBS/images/common/back.gif[/img][/url]
The narrow tail band and fairly clear-cut, obviously pale inner primaries and pale bill base identify this bird as Yellow-legged Gull.
GeoffC [/quote]
Well, Yellow-legged Gull - Larus michahellis - occurs only in Europa. Together with Caspian Gull - Larus cachinnans is was once one species, but they have been split.
Furthermore the bird in the picture, a Mongolian Gull, has been lumped under Vega Gull - Larus vegae.
So it's a Vega Gull - Larus vegae, or more broadly a Mongolian Gull - Larus vegae mongolicus.
See [url]http://www.worldbirdnames.org/bow/coursers/[/url] to get it 'always right', until they split and/or lump again... The HKBWS does not follow this and so would call this gull a Caspian Gull - Larus cachinnans.
kc3018 2/02/2015 18:27
Thank you GeoffC and Bart.