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To manyee: Dark streakred45::2010-02-07 8:02
Hello Man Yee!

Thank you for your kind words! I'm not 100% sure about dark streak but I think it is for two purposes. Firstly - camouflage - black eye is too well visible on bright feathers. Secondly - I think it is to protect eye during fights or attack of predator - predator don't know where to hit to damage real eye when all streak including eye is equally dark.

I just founded third answer from very different field:

Q: Why do American footballers paint black marks across their cheeks?
A: Cuts the glare of the sun or bright lights.

Best regards,
Greg!
Poland
Title: Walkabout With KaszekCanon EOS 400D
Walkabout With Kaszek (28)
red45 Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2636 W: 74 N: 9100] (31094)
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To manyee: Dark streak red45 Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2636 W: 74 N: 9100] (31094)::2010-02-07 08:02
:Re: To manyee: Dark streak manyee Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 3089 W: 230 N: 6774] (23770)::2010-02-07 09:27