1. Are there any statistics on the respective percent of the world's
population who have eye colors of brown, blue, grey, green or other?  
2. Which are the most common to least common?
3. Are there eye colors in animals that do not occur in humans?

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Request for Question Clarification by pafalafa-ga on 19 Mar 2005 18:37 PST

ccg,

Your third question is so different from the first two, that it would
be very hard to research them all within the confines of a
modestly-priced question.

You may want to consider focusing on the first two questions, and
perhaps ask the third as a separate question.

Just a suggestion...

pafalafa-ga

But the third question is easiest to answer:  yes, yellow: cats for
sure and some reptiles, I believe.  I don't think the "yellow" in the
eyes of persons with jaundice
count as an eye-color for humans.
Did it ever occur to you that the word "iris" for a part of the eye
says something about the eyes of the people who initially used the
expression?

Brown eyes are most common for hummans followed by blue. Some of the
other colors are somewhat debatable and can change with lighting
conditions, state of health etc. Reasonably accurate estimates should
be possible.   Neil