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Subject: 係咪北極鷗 [Print This Page]

Author: skwjack Time: 24/02/2012 20:46 Subject: 係咪北極鷗

上兩個星期日米埔浮橋外新屋影

[ 本帖最後由 skwjack 於 24/02/2012 20:52 編輯 ]

Image Attachment: SKW_4682.jpg (24/02/2012 20:46, 193.94 KB) / Download count 530
http://hkbws.org.hk/BBS/attachment.php?aid=10782

Image Attachment: SKW_4686.jpg (24/02/2012 20:52, 191.87 KB) / Download count 513
http://hkbws.org.hk/BBS/attachment.php?aid=10783

Author: HFCheung Time: 26/02/2012 16:22

Yes, I think so.

Author: skwjack Time: 28/02/2012 20:28

唔該哂師兄

Author: brendank Time: 28/02/2012 21:59

This is an interesting bird. Because of the brown tail band, it isn't the Glaucous but doesn't fit any "pure" species well. Likely a hybrid. Please post some more pictures if available.

Author: kkoel Time: 28/02/2012 23:31

Looks like a first-year Mongolian - save the pale wingtips!

Author: brendank Time: 28/02/2012 23:49

My initial impression this bird is a "Nelson's Gull", a hybrid between Glaucous Gull x Herring Gull (usually L. a. smithsonianus but perhaps possibly L. a. vegae).

The tail band rules out Glaucous Gull. The sharp-bicolored bill rules out Glaucous-winged, Slaty-back, Thayer's. Primaries are altogether too pale for Vega or Heuglin's. I think the primaries are also very pale for Mongolian Gull and the bill is extremely crisply bicolored which I don't think fits Mongolian too well.

Nelson's Gull are seen on both the east and west coast of North America. I can remember personally at least two adults during my North America birding days. Photos of 1st winter birds are very similar to this

Author: brendank Time: 28/02/2012 23:53

Incidently I just noticed this bird seems to be around on February 12.

http://www.hkbws.org.hk/BBS/viewthread.php?tid=15820

The bird in the second and third picture is clearly different. Notice on the Glaucous Gull how pure white the primaries are.

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