HKBWS BBS 香 港 觀 鳥 會 新 聞 組    Discussion Area 討論區    Photo Gallery 相片分享 I (Moderators: carmen, BBS Moderators, Forrest FONG, Kwok Jai, George_Ho)    Black-tailed Gull 黑尾鷗   « Previous topic | Next topic » Pages: 1  Reply Send Topic Print    Author  Topic: Black-tailed Gull 黑尾鷗    (Read 786 times) Hendrix BBS Member BBS God I love wings!     Gender: Posts: 1001 Black-tailed Gull 黑尾鷗   « on: Dec 27th, 2005, 10:55pm » Quote Modify FIRST WINTER ?   #1 http://www.look.com.hk/wings/gulls/btailed/004.jpg   #2 http://www.look.com.hk/wings/gulls/btailed/005.jpg   AFS600/4 + 1.4X on D2X , 1/1000 , F5.6 , ISO 500   27/12/05 NSW « Last Edit: Jan 25th, 2006, 4:29pm by BBS Moderators » Logged www.look.hk welcome you JanJ BBS Member BBS Junior Member I love bird watching!     Posts: 11 Re: Black-tailed Gull 黑尾鷗   « Reply #1 on: Dec 28th, 2005, 6:32am » Quote Modify Hi Hendrix!   Does not look like a Black-tailed Gull of any age. Take a look at these:   http://larus.hp.infoseek.co.jp/a_Bt-G.html   I think it is one of the large white-headed gulls, probably mongolicus.   Last image here:   http://vegae.hp.infoseek.co.jp/MonJ_2wYam/MonJ_2wYam.html   JanJ   « Last Edit: Dec 28th, 2005, 6:33am by JanJ » Logged Anton BBS Member BBS God Watch me if you can~     Gender: Posts: 142 Re: Black-tailed Gull 黑尾鷗   « Reply #2 on: Dec 28th, 2005, 6:52am » Quote Modify Hi JanJ~   Or could it be a Vega gull?     Anton Logged JanJ BBS Member BBS Junior Member I love bird watching!     Posts: 11 Re: Black-tailed Gull 黑尾鷗   « Reply #3 on: Dec 28th, 2005, 7:53am » Quote Modify Well, it could I suppose. I think  that the rather lightly streaked head, (it is December) with streaks/spots confined to the neck, rather similar to a cachinnans, and the somewhat parallel shaped bill, with a well defined black tip, is good for mongolicus. As always identification is tentative, due to variation (!), but it could well be a vegae, but there is a  mongolicus feel to it.   JanJ Logged gjcarey BBS Member BBS God     Posts: 115 Re: Black-tailed Gull 黑尾鷗   « Reply #4 on: Dec 28th, 2005, 10:42am » Quote Modify I do not think this is mongolicus. The mixture of varying age (different patterns and colours) feathers indicates that this is not a first-winter bird. That given, then it cannot be mongolicus, which shows a clean pale grey mantle in second winter plumage, with largely white underparts and tail, the latter with a varying though usually rather narrow tail band. Mongolicus in its first winter does not replace very many coverts at all, usually just a small number of inner wing coverts by the end of the winter.   My suspicion is that this is a second-winter HK heuglini. This carries out a more or less continuous moult through its first winter and into the first summer, which results in this rather variegated appearance to the upperparts in the second winter. The tail band is still broad and blackish though, which is a good indicator of heuglini. And is that one or more pure and fairly dark grey feathers in the middle of the secondary median coverts on the left wing?? The inner primaries are a little pale, which might suggest some vegae influence.   Regards,   Geoff Logged JanJ BBS Member BBS Junior Member I love bird watching!     Posts: 11 Re: Black-tailed Gull 黑尾鷗   « Reply #5 on: Dec 29th, 2005, 12:18am » Quote Modify No, not a 1st winter bird of course, and the plain looking greater covert pattern would perhaps not be so good for 2nd winter type mongolicus. like this:   http://www23.tok2.com/home/jgull/051118/mongolicus2w.htm   JanJ Logged Pages: 1  Reply Send Topic Print Forum Jump: ----------------------------- Announcement 簡訊通告 -----------------------------  - Membership Affair 會員事務   - Outings / Activities 戶外活動 / 講座   - Projects 項目計劃   - Crested Bulbul Club 紅耳鵯俱樂部 ----------------------------- Discussion Area 討論區 -----------------------------  - General 一般問題   - Conservation 自然保育   - Bird Identification 鳥類辨識   - Birding Reports & Tips 觀鳥報告及心得 => Photo Gallery 相片分享 I   - Photo Gallery 相片分享 II ----------------------------- Special Topics 特別主題 -----------------------------  - Wild Birds & Avian Flu 野鳥與禽流感   - Sustainable Management Scheme in Long Valley 塱原可持續生態管理計劃   - Black-faced Spoonbill 黑臉琵鷺   - Goodbye Penfold 告別彭福   - Tern Conservation 燕鷗保育   - Black-eared Kite 鳶(麻鷹)   - Swifts and Swallows 燕與雨燕   - China Birdwatching Network 中國觀鳥活動網絡   - Winter Altas Survey 冬季鳥類普查   - Nature Conservation Policy 自然保育政策 ----------------------------- Knowledge Sharing 知識分享 -----------------------------  - FAQ 常見問題   - Archive 資料重溫 « Previous topic | Next topic »

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