cthomas 23/03/2009 22:17
Glaucous-Winged Gull? 灰翅鷗?
22/3/2009
Mai Po 米埔
cgeoff 24/03/2009 12:19
Quite tricky with such distant shots as this. However, I think this is probably Slaty-backed Gull. The tertials and primaries in the closed wing appear rather dark, and overall the bird is a little darker than I would expect 1y Glaucous-winged to be, esp the tail.
Geoff
lpaul 24/03/2009 13:25
Do you have any pictures which show the under wing, especially the underside of the primaries. These are strikingly pale on 1st winter G-w Gull. I would favour G-w Gull, but without better photos it is difficult to be sure. I think the overall uniformity of the bird (especially the lack of a pale rump/uppertail coverts) fits G-w Gull better than Slaty-backed.
[[i] Last edited by lpaul at 25/03/2009 11:38 [/i]]
cthomas 11/04/2009 22:57
Thanks for all reply!
I have took another picture today. May this one be a GW Gull?
11/4/2009
Mai Po
[[i] Last edited by cthomas at 11/04/2009 23:20 [/i]]