HKBWS BBS 香 港 觀 鳥 會 新 聞 組    Discussion Area 討論區    General 一般問題 (Moderators: Webcreeper, BBS Moderators)    frequency 問：雀鳥能夠聽到的音頻範圍 « Previous topic | Next topic » Pages: 1  Reply Send Topic Print    Author  Topic: frequency 問：雀鳥能夠聽到的音頻範圍  (Read 722 times) ●_● BBS Member BBS Newbie I love bird watching!     Gender: Posts: 2 frequency 問：雀鳥能夠聽到的音頻範圍 « on: Nov 23rd, 2005, 2:33pm » Quote Modify Dear birdmates,   Just wanna help my friend to ask a question. Does anyone know the frequency that birds can hear?   Or, any books related to this topic recommended?   thanks!   ●_● « Last Edit: Nov 23rd, 2005, 8:57pm by Webcreeper » Logged Webcreeper BBS Moderator BBS Member BBS God I'm a webcreeper     Gender: Posts: 1031 Re: frequency 問：雀鳥能夠聽到的音頻範圍 « Reply #1 on: Nov 23rd, 2005, 9:01pm » Quote Modify Given the key words and a little patience, you can usually get some answers from the net :     From: Wild Birds online   Bird Sense   “The range of frequencies heard varies among birds according to species. The Hairy woodpecker hears from a high of 18,400 to a low of 34 cycles per second, giving rise to the concept that this woodpecker can hear wood boring insects as they move along underneath the bark and wood of trees. Starlings hear nearly as well as we do at high to mid range (15,000 cycles per second), but their hearing fails at 650 on the low end. Man can hear about four octaves lower than the pigeon and five octaves lower than the starling or house sparrow. While they may not hear as wide a range as we can, birds are about ten times as sensitive to rapid changes in pitch and intensity. They can differentiate between frequencies less than 1% apart and separated by only .6 to 2.5 milliseconds.”     From: Ask Jeeves!   Hearing and the Bird Ear   “The range of hearing in many species of birds is comparable with that of mankind. Having a greatest sensitivity between 2000 and 4000 hertz (cycles per second). This is partly why bird song is so useful in bird identification - it is easy for us to hear - and partly why we find bird song so pleasant. In birds as a whole, the known hearing ranges vary from a lower limit of below 100 hertz to over 29000, though not all birds have this range. The common Mallard (Anus platyrhynchus) for instance has a range from 300 hz to 8000 hz….”     Logged 　　　　　　　>}o-}o-　　　>}o-　　　　　　　　　>}o-　　　　.......x ●_● BBS Member BBS Newbie I love bird watching!     Gender: Posts: 2 Re: frequency 問：雀鳥能夠聽到的音頻範圍 « Reply #2 on: Nov 24th, 2005, 4:34pm » Quote Modify thanks a lot for your prompt reply and your useful info   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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