HKBWS BBS 香 港 觀 鳥 會 新 聞 組    Discussion Area 討論區    Photo Gallery 相片分享 I (Moderators: BBS Moderators, George_Ho, Kwok Jai, carmen, Forrest FONG)    Slaty-backed Gull 灰背鷗 In-flight 飛行 « Previous topic | Next topic » Pages: 1  Reply Send Topic Print    Author  Topic: Slaty-backed Gull 灰背鷗 In-flight 飛行  (Read 1121 times) Daniel CK Chan BBS Member BBS God I love nature photography!     Gender: Posts: 794 Slaty-backed Gull 灰背鷗 In-flight 飛行 « on: Apr 24th, 2004, 7:15am » Quote Modify 167 Slaty-backed Gull 灰背鷗 Mai Po 米埔 20/4/2004   10D + 500 + 1.4x   http://kite.center.kl.edu.tw/vbb/attachment.php?s=&postid=116235 http://kite.center.kl.edu.tw/vbb/attachment.php?s=&postid=116234   A 1st winter one. Would you suggest the reasons of the worn-out feather. Thanks. « Last Edit: May 25th, 2004, 12:44pm by BBS Moderators » Logged Daniel CK Chan http://www.danielckchan.com KK Hui BBS Member BBS God Bird Photography - at its best ...     Posts: 940 Re: Vega Gull 紅腳銀鷗 In-flight 飛行 « Reply #1 on: Apr 24th, 2004, 9:15am » Quote Modify Daniel,     I like both shots particularly the first one. Yes, wished its feathers were in a better shape!     KK Hui ARPS www.geocities.com/kkhui_001 Logged gjcarey BBS Member BBS God     Posts: 115 Re: Vega Gull 紅腳銀鷗 In-flight 飛行 « Reply #2 on: Apr 24th, 2004, 2:30pm » Quote Modify Excellent shot Daniel.   It's actually a 1st year Slaty-backed Gull. The mantle is too dark and grey and the tail band can be seen to be very broad - almost the whole tail is uniform brown. The head is paler than the body and it is a rather bulky bird with broad-based wings and thick neck.   The feathers are so badly damaged because of the damage that exposure to the sun causes. This bird has probably been wintering further south, where the winter sun is even stronger than it is here. The sun causes feathers to fade and it also breaks them down. Paler feather areas are more susceptible to damage than darker; you can see this effect on this bird.   Slaty-backed Gulls seem particularly prone to this kind of damage, but that may be related to the fact that the vast bulk of the population winters quite far north in east Asia, mostly in Japan. There, the sun is far weaker and days much shorter; consequently, less damage is caused to feathers, and so the species has evolved without strong resistance.   Incidentally, I'm pretty sure this is the latest HK record of this species.   Well done!   Geoff   Logged Daniel CK Chan BBS Member BBS God I love nature photography!     Gender: Posts: 794 Re: Slaty-backed Gull 灰背鷗 In-flight 飛行 « Reply #3 on: Apr 24th, 2004, 6:55pm » Quote Modify Geoff, Thanks for clarification and detailed information. I have difficulties to distinguish two species especially that they are quite similar in 1st winter. Thanks again. Regards Daniel Logged Daniel CK Chan http://www.danielckchan.com 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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