Susan: I had similar thoughts about iridology, but I think Mauro's point
does not apply to iridology as a bogus medical profession. The colour of
the eyes can apparently be a very powerful stimulus to other birds. If
so, a change in hue, configuration or any imperfection may be meaningful.
When I first read Mauro's comment I could envision that there were
circumstances occuring - say during moult - that could negatively impact
of the deposition of pigments in the iris; could a small difference in the
amount of pigment be noitcable. In particular, I was thinking about red
eyes. If the red colour is due to the deposition of a carotenoid pigment -
I have no idea at this point - then I may have a case. Recall
that some birds lose their colour if their diet does not contain
sufficient amounts of cartenoid, e.g. House finches, probably
Crimson Chats and of course flamigos.
Hopefully, someone else can enlighten us further.
Cheers, Jim
Dr. Wm. James Davis
e-mail
Susan wrote
> I don't want to be picky but you say you want serious discussion, then
> bring up the topic of iridology, of all things! Iridology has been totally
> discredited by the medical professions and has no basis in science. I doubt
> whether it could or would be used by birds to choose mates. I'm probably
> going to get into all sorts of trouble now, as I know that believers in
> naturopathy, aromatherapy, moxibustion, etc. have strong views on the
> subject (as I do) but please show me some proof! And show me its relevance
> to bird behaviour - apart from the science of pigeon fancying.
>
>
> Susan Myers
> phone: +61 3 9819 2539
> Email:Susan Myers
>
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