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Sex and eye colour?

Lwalker

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I just found out today that Miss Cocoa could be Mr. Cocoa! Basically, there is no proof but what the shelter said (they have no tests). Then I read somewhere that RLA females have irises that are more brown while males are more orange and the colours get more intense as they age. Has anyone heard this? I know the only definitive answer is a DNA test but I am curious.
 

expressmailtome

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There is a similar way to tell the gender of several cockatoo species as well.
 
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