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Subject: [Hong Kong] Slaty-backed Gull ? [Print This Page]
Author: kc3018    Time: 1/02/2015 13:00     Subject: Slaty-backed Gull ?

2015.01.24
Nam Sang Wai







Thz for your help.

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http://hkbws.org.hk/BBS/attachment.php?aid=20615



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Author: cgeoff    Time: 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
Author: badesc    Time: 1/02/2015 23:44

Quote:
Original posted by cgeoff at 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
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 http://www.worldbirdnames.org/bow/coursers/ 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.
Author: kc3018    Time: 2/02/2015 18:27

Thank you GeoffC and Bart.



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