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Topic: Crested Serpent Eagle 蛇鵰 (Read 712 times) |
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Mike Kilburn
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Re: Crested Serpent Eagle ??
« Reply #1 on: Aug 1st, 2003, 9:36am » |
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congratulations Daniel! I haven't seen the Ng Tung Chai bird on its perch for some time, but with such a good flight shot doesn't really matter-la! Mike
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KK Hui
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Bird Photography - at its best ...
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Re: Crested Serpent Eagle 蛇鵰
« Reply #2 on: Aug 1st, 2003, 4:57pm » |
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Excellent shot, Daniel! 500 + 1.4x ?? Best kk -------------- www.geocities.com/kkhui_001
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« Last Edit: Aug 1st, 2003, 4:58pm by KK Hui » |
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Daniel CK Chan
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I love nature photography!
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Posts: 794
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Re: Crested Serpent Eagle ??
« Reply #3 on: Aug 1st, 2003, 11:07pm » |
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on Aug 1st, 2003, 9:36am, Mike Kilburn wrote:congratulations Daniel! I haven't seen the Ng Tung Chai bird on its perch for some time, but with such a good flight shot doesn't really matter-la! Mike |
| Mike, Thanks. Would it be a 1st or 2nd year immature bird? KK, The photo is shot with 500+1.4+Wimberley Head. Daniel
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Daniel CK Chan http://www.danielckchan.com
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Mike Kilburn
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Re: Crested Serpent Eagle ??
« Reply #4 on: Aug 2nd, 2003, 10:12am » |
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I'm not an expert on aging raprtors, but in the photo you can see that it is moulting its inner primaries. These new feathers have a contrasting strong black tip and a broad white band across the feathers. When they grow to full length this will become the classic broad white bar with a black border along the rear edge of the wing which is the diagnostic feature for flying CSEagle. However the feathers which are not yet moulted have narrower brown lines and the tips are no so dark. This is typical juvenile plumage. I do not know how long this plumage is retained and would welcome the opinions of others, especially those who know about the moult strategies of eagles. You can also see that the spotting on the breast and belly is well defined as an adult would show, but raptors moult these feathers first and then replace their fligth feathers during the summer. "Birds of Prey in Japan" states that juvile plumage is replaced by full adult plumage by the end of the autumn of the second calendar year. This would correspond with the plumage of this bird. so my guess (I stress Guess!) is that it is a second year bird which will be in full adult plumage by the end of the year! Cheers Mike
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Daniel CK Chan
BBS Member BBS God
I love nature photography!
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Posts: 794
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Re: Crested Serpent Eagle ??
« Reply #5 on: Aug 2nd, 2003, 11:28am » |
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on Aug 2nd, 2003, 10:12am, Mike Kilburn wrote:I'm not an expert on aging raprtors, but in the photo you can see that it is moulting its inner primaries. These new feathers have a contrasting strong black tip and a broad white band across the feathers. When they grow to full length this will become the classic broad white bar with a black border along the rear edge of the wing which is the diagnostic feature for flying CSEagle. However the feathers which are not yet moulted have narrower brown lines and the tips are no so dark. This is typical juvenile plumage. I do not know how long this plumage is retained and would welcome the opinions of others, especially those who know about the moult strategies of eagles. You can also see that the spotting on the breast and belly is well defined as an adult would show, but raptors moult these feathers first and then replace their fligth feathers during the summer. "Birds of Prey in Japan" states that juvile plumage is replaced by full adult plumage by the end of the autumn of the second calendar year. This would correspond with the plumage of this bird. so my guess (I stress Guess!) is that it is a second year bird which will be in full adult plumage by the end of the year! Cheers Mike |
| Many thanks for your informative explanations. If your guess is true, I strongly want to see or take photos of him/her again by the end of this year when he shall show his/her beautiful full adult plumage. ::)
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« Last Edit: Aug 2nd, 2003, 11:30am by Daniel CK Chan » |
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Daniel CK Chan http://www.danielckchan.com
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