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Re: Homing Pigeons? Try Homing Crocodiles...




"Mickey Rowe;893-2446" wrote:
> 
> Dann Pigdon <dannj@alphalink.com.au> wrote:
> 
> > There's no reason to suspect that the homing abilities of birds and crocs
> > are due to the same physiological adaptations - especially since it's now
> > been shown that birds can see magnetic fields via adaptations in the eye
> > itself (not something you'd expect in largely nocturnal crocs).
> 
> Two things of import... first a quasi-philosophical issue... it is
> probably not correct to say that birds "see" magnetic fields.  The
> fact that light receptors in their eyes appear to be involved in
> magnetic field detection doesn't make that detection anything like
> vision and hence seeing.

The latest neurological research by German scientists has shown that signals
sent by cryptochromes in the eyes of garden warblers are processed by the optic
lobe in the brain:

http://www.abc.net.au/news/stories/2007/09/27/2044505.htm

-- 
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Dann Pigdon
GIS / Archaeologist              geo cities.com/dannsdinosaurs
Melbourne, Australia             heretichides.soffiles.com
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