The eyes of animals that possess a tapetum lucidum glow
in the dark when exposed to a light source due to retroreflectivity. The
color varies with species. Do you know which animals in the western
United States exhibit red eye color due to retroreflectivity?
You will have to check the literature, but I think an answer is HUMANS. I
believe this is the cause of the "red eye" effect when you photograph a
person "head on". The eyes look like two red dots.
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Update: June 2012