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Topic: White-fronted Goose (Read 609 times) |
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HKBWS Office
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White-fronted Goose
« on: Nov 10th, 2004, 5:39pm » |
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A juvenile White-fronted Goose was found at Lok Ma Chau on 8 November 2004. Please find below photo of the bird. The area is a Frontier Closed Area, it is also the KCRC private land. Access to the area is restricted. Share with you this interesting information: Date: 9 November 2004 Time: 7:30am Equipment: Nikon Coolpix 4500 + Swarovski ATS 65HD
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« Last Edit: Nov 10th, 2004, 9:18pm by HKBWS Office » |
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From the HKBWS Office
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KK Hui
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Re: White-fronted Goose
« Reply #1 on: Nov 10th, 2004, 7:18pm » |
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Thanks for sharing these shots! Why are we seeing mostly juveniles when it come to rare visitors? KK Hui ARPS www.geocities.com/kkhui_001
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pippenho
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Re: White-fronted Goose
« Reply #2 on: Nov 10th, 2004, 7:49pm » |
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on Nov 10th, 2004, 7:18pm, KK Hui wrote:Thanks for sharing these shots! Why are we seeing mostly juveniles when it come to rare visitors? KK Hui ARPS www.geocities.com/kkhui_001 |
| 小朋友貪玩易走失
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Betty
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Re: White-fronted Goose
« Reply #3 on: Nov 10th, 2004, 9:05pm » |
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See if quotation from the book "Birds & Weather- A Birdwatcher's Guide" by Stephen Moss can give us some hints. " Migrants appear to use a variety of cues and mechanisms to find their way successfully. Some of these are inherited, others learned from experience. One inherited mechanism-vector navigation- is the main method used by juvenile and first-winter birds undertaking their first outward migration. Vector navigation is similar to the 'point -and-compass' method used by early sailors. In practice, vector navigation is crude and not very effective- even the lightest of crosswinds would, if not corrected, send the bird many kilometres off course. Over-reliance on the simpler method of vector navigation probably explains why such a high proportion of wind-drifted autumn vagrants are juveniles of first-winter birds, on their first outward journey. " This also explains why they are rare visitors. They are off-course, this may not be their route. Adults have many other skills to compensate. The above book has detail explanation, plus historical events & data to tell the whole story of migration. Very interesting. I borrowed it from public library.
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« Last Edit: Nov 10th, 2004, 10:02pm by Betty » |
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Anguslau
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Re: White-fronted Goose
« Reply #4 on: Nov 11th, 2004, 11:22am » |
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Thanks very much for the info, Betty. If I have the choice, I like the juveniles more than the adults. They all have beautiful fresh plumage! Hope they like it here and will come back next year. But our awful polution really doesn't help...
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KK Hui
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Re: White-fronted Goose
« Reply #5 on: Nov 11th, 2004, 7:31pm » |
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Thanks for the interesting info, Betty! Just hope these youngsters will manage their way home when the time comes using this simple "vector navigation" method ... And I thought bird migration never takes place with just one single bird when on the move anyway?! KK Hui ARPS www.geocities.com/kkhui_001
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madsen122020
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Re: White-fronted Goose
« Reply #6 on: Nov 11th, 2004, 8:40pm » |
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What is the chinese name of White-fronted Goose
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要比普通人付出更大的努力,更多的時間
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Betty
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Re: White-fronted Goose
« Reply #7 on: Nov 11th, 2004, 9:12pm » |
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I also have the same question : Most birds migrate in flocks but how come we only see one or two birds of a certain species. Could it be these youngsters not so strong & skillful in long distance flight that they are BLOWN off course ? or they are a bit lag behind so cannot catch the flock ? or we can apply Pippenho's theory since different birds have their own character.
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Betty
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Re: White-fronted Goose
« Reply #8 on: Nov 11th, 2004, 9:20pm » |
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on Nov 11th, 2004, 8:40pm, madsen122020 wrote: What is the chinese name of White-fronted Goose |
| 白額雁
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