Photo Jeremy Black
The yellow Cardinal (above) was spotted earlier this year, in the backyard of Charlie Stephenson in Alabaster, Alabama. Best guess as to an explanation is a genetic mutation called xanthochroism. Other causes could perhaps be environmental stressors of poor diet.
Photo Brian Peer
Also of interest to birders might be a Northern Cardinal with half female and half male plumage which was observed and photographed many times, between 2008 and 2010, near Rock Island, Illinois, about 200 kms. west of Chicago. The cause in this case of feathered fantasy is said to be a condition known as bilateral gynandromorphs.
Please comment if you wish.
BarrytheBirder
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