Wow! Thank you for the information on bird vision. I did not realize
how many more colors they see!
Ronn!Blankenship <[EMAIL PROTECTED]> wrote
From <<http://www.bio.bris.ac.uk/research/vision/4d.htm>>:
"Bird colour vision differs from that of humans in two main
ways. First, birds can see ultraviolet light. .... It is mammals,
including humans, that have poor colour vision! Whilst UV
reception increases the range of wavelengths over which birds can
see, increased dimensionality produces a qualitative change in the
nature of colour perception that probably cannot be translated
into human experience. ...
Also, if you ever are able to reproduce the
charts of the area around the constellation Orion showing what it
would look like to each of those (based only on the sensitivity)
I would be very interested. This is all new to me.
Another statement I came across from somewhere is that a rabbit's
eyes are so sensitive to movement that she could actually see the
Sun moving across the sky.
Hah! That is amazing.
Another question, what kind of resolution do birds have in ordinary
light? I know, from observation, that I can readily see a dark
vertical line, a tower, against a light background, the sky, when its
width is one in three-thousandsth of a radian or about one minute of
arc. (Roger Clark, in `Visual Astronomy of the Deep Sky', provides
more detailed information that involves the surface magnitude of the
background. Where I have made comparisons, his information agrees
with my personal experience.)
--
Robert J. Chassell
[EMAIL PROTECTED] GnuPG Key ID: 004B4AC8
http://www.rattlesnake.com http://www.teak.cc
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