Why do my macaw's pupils dilate when she talks?

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Offline thedoc

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Why do my macaw's pupils dilate when she talks?
« on: 24/09/2012 18:30:01 »
Nick Dunn  asked the Naked Scientists:
   
Hi,

I am currently looking after my friend's Macaw for a week and have noticed that, when she talks, her pupil contacts then quickly dilates again. Why is this?

Thanks,
Nick Dunn
   
What do you think?
« Last Edit: 24/09/2012 18:30:01 by _system »