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The folks at the University of Edinburgh are still trying to figure out HOW these birds occur. There are a few theories. It was believed that they have more than one father but according to one or two other BYC members who hatched gynandromorphs, they had only two possible parents. At any rate, it is extremely rare that the parents are known since most gyandromorphs appear in hatcheries that hatch hundreds of thousands of chicks. Also, there is no known documentation of any being raised from a chick, reporting changes that occur and photos. You and I appear to be the first.