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係咪北極鷗

上兩個星期日米埔浮橋外新屋影

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

Yes, I think so.

唔該哂師兄3551d16c4689445 3551d16c4689445 3551d16c4689445

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.

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

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

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

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

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

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