Brightly coloured iris April 16, 2013

I have always wondered why our iris are colored ,Why do they change in some from blue to green or blue to brown as one grows… We humans have iris of shades brown,black,blue,green and other shades more or less  the same.
But when it comes to birds in many we see brightly colored eyes like in pigeons , koels, parakeets. There are other birds too with beautiful bright eyes, but I these are the ones I see almost everyday.
I tried googling but did not get any good results.
I found this website   http://10000birds.com/eye-color-in-birds.htm
It says eye color changes with breeding season and age in birds. It may be to attract potential mate. There is no definite answer to this question.
At the end of the day, there may not be any definite reason but one thing is sure the sight of those beautiful eyes is always delightful :)
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