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Title : "Rare half-male, half-female cardinal spotted in Pennsylvania."
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"Rare half-male, half-female cardinal spotted in Pennsylvania."

"Gynandromorphy like that in this cardinal occurs when a female egg cell develops with two nuclei—one with a Z and one with a W—and it’s 'double fertilized' by two Z-carrying sperm. The chimeric individual then develops with half of its body as a male ZZ and the other half as a female ZW. If you were to examine a cell from the bright red male side, it would have cells with ZZ chromosomes. If you looked at a cell from the left, it would have cells with ZW chromosomes. This phenomenon happens in birds, many insects, and crustaceans.... Part of what makes this particular cardinal so exciting... is that it may be able to reproduce. 'Most gynandromorph individuals are infertile, but this one may actually be fertile as the left side is female, and only the left ovary in birds in functional.'... [T]he cardinal is always in the company of a male. 'We’re happy it’s not lonely'...."

(National Geographic.)

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