From: Dave Land <[EMAIL PROTECTED]> Reply-To: Killer Bs Discussion <[EMAIL PROTECTED]> To: Killer Bs Discussion <[EMAIL PROTECTED]> Subject: Avian Magnetic Vision (was Re: Horses) Date: Tue, 10 Aug 2004 16:00:19 -0700
On Aug 10, 2004, at 3:33 PM, Travis Edmunds wrote:
Just asking a question here. Does anyone know or remember which type of bird navigates by actually 'looking at' the Earth's magnetic poles? Apparently they can actually see something like a red orb which they use as a landmark of sorts.
This <http://www.ks.uiuc.edu/Research/magsense/ms.html> appears to be the source
of the image showing the "red orb" (the image appeared in the document labeled
"Graphs and Stuff" in Ronn's "Birds, was Horses" message of a couple of days ago.
I don't think the image was intended to suggest that birds actually see a red orb,
but to suggest that some kind of visual indication of magnetic orientation may be
incorporated into avian vision.
I never read Ronn's 'Birds, was Horses message'. Nor did I check out that URL. As far as I can recall I saw all this on the tube in a documentary.
And as far as the red orb thingy goes, I'm not really sure if that's what the birds actually see. All I remember is that the audience was presented with an animation showing that orb. As for what else I remember - well, the magnetic poles thing AND that this was a particular species of bird. Not birds in general.
-Travis
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