Can someone tell me the actual reason why some House Finches display not
only the orange variant plumage, but yellow, as well? (See link for a
photo of a yellow variant:
We are discussing the possible reasons on Nature Net's Bird Watching
Forum ( http://nature.gardenweb.com/forums/bird
) and they are running
the gamut from nutritional deficiencies to the age factor. Somehow, I
remember Penny Seaman telling me that George Chaniot or one of the other
ornithologists in this group had read the actual reason, and I would
like to know.
Thanks in Advance,
"Rapture....the only way to fly!"
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