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Animal with Three Eyes

  • From: P3D Paul S. Boyer <boyer@xxxxxxxxxxxxx>
  • Subject: Animal with Three Eyes
  • Date: Sun, 14 Apr 1996 22:48:22 -0400 (EDT)
Wolfie writes from Australia about a New Zealand reptile with three eyes.
He calls it a "lizard," but it is actually *not* a lizard.  It is the 
Sphenodon, or tuatara, a true "living fossil," the only living 
rhynchocephalian.  That means that it is the sole survivor of a whole 
reptilian order.
The third "eye" is merely a light-sensitive area, and does not form an 
image, so it is virtually useless for sensing depth.
There are many arachnids with more than two eyes.  I have no idea how 
they perceive depth, and I have never seen one holding a stereoscope.
--P. S. Boyer   <boyer@xxxxxxxxxxxxx>


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End of PHOTO-3D Digest 1284
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