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 Post subject: Re: Bird Quizz (RV)
Unread postPosted: Thu Jul 19, 2012 7:10 pm 
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:hmz:

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 Post subject: Re: Bird Quizz (RV)
Unread postPosted: Fri Jul 20, 2012 8:44 am 
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Pied babbler ?

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 Post subject: Re: Bird Quizz (RV)
Unread postPosted: Sat Jul 21, 2012 12:59 am 
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Penguins?

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 Post subject: Re: Bird Quizz (RV)
Unread postPosted: Sat Jul 21, 2012 6:31 am 
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I think it is some or other water bird like a coot or something.

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 Post subject: Re: Bird Quizz (RV)
Unread postPosted: Sun Aug 05, 2012 8:57 pm 
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Hi all :yaya:
Been a while. Got tangled up in the rat race.
Think big on the birds :wink:

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 Post subject: Re: Bird Quizz (RV)
Unread postPosted: Sun Aug 05, 2012 11:37 pm 
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Ostrich

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 Post subject: Re: Bird Quizz (RV)
Unread postPosted: Tue Aug 07, 2012 8:29 pm 
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Well done Imberbe! You are it. . .

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 Post subject: Re: Bird Quizz (RV)
Unread postPosted: Tue Aug 07, 2012 9:12 pm 
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:dance:

I will not be able to post for a few days ...

First to post is IT!

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 Post subject: Re: Bird Quizz (RV)
Unread postPosted: Wed Aug 08, 2012 9:06 am 
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Why do birds of prey spiral when moving in an upward direction in the sky?

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 Post subject: Re: Bird Quizz (RV)
Unread postPosted: Wed Aug 08, 2012 9:58 am 
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onewithnature wrote:
Why do birds of prey spiral when moving in an upward direction in the sky?


To stay in the hot wind currents that goes upwards.

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 Post subject: Re: Bird Quizz (RV)
Unread postPosted: Fri Aug 10, 2012 12:48 am 
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Yes, Rooies, but then why spiral - why not just float upwards on extended wings?

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 Post subject: Re: Bird Quizz (RV)
Unread postPosted: Fri Aug 10, 2012 8:18 am 
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I will take a wild guess here. The updrafts doesn't stay in the same place and moves constantly. The birds must go in circles to test and exploit the best currents.

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 Post subject: Re: Bird Quizz (RV)
Unread postPosted: Sat Aug 11, 2012 6:36 am 
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Intelligent guess, Rooies, but not exactly correct.

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 Post subject: Re: Bird Quizz (RV)
Unread postPosted: Tue Aug 21, 2012 11:18 pm 
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The updraft can be likened to a bubble of air which is created when you boil water. The bubble starts at the bottom and then moves upward, eventually detaching itself from the area where it started. It can also move horisontally across the landscape at the same time.

Though it is much bigger than the boiling water bubble, it remains rather confined and the birds needs to keep within this updraft to get the lift. To achieve this, it needs to spiral within the bubble. Some birds are not able to spiral in such a confined space and can therefore not use the updrafts effectively.

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 Post subject: Re: Bird Quizz (RV)
Unread postPosted: Wed Aug 22, 2012 1:18 am 
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IB :clap: :clap: :thumbs_up:

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