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係咪北極鷗

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.

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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

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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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