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RE: Bird (Dinosaur?) vision

From: Lawrence_Dunn@smbcgroup.com
Is it true that some birds can see only movement -- that they cannot "see"
something that is not moving?  I've recently had this suggested to me, but
I'm not sure I see the sense of it.  Is there such a condition in nature?
If so, what is it called?

I'm skeptical about this condition existing in birds, but I have read that it exists in frogs. The sense of it is probably that, if you don't have a lot of brain-power to spare, the really _vital_ things for you to see are almost always going to be the moving ones...especially if you eat insects and not plants.

And it's probably not a case of absolute stillness = invisibility either, just an extreme loss of definition.

Eric
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"There is no other wisdom,
And no other hope for us
But that we grow wise. -- Diane Duane
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