Half-male, half-female animals: How gynandromorphs occur in nature (VIDEO).

The Biology of a Half-Female, Half-Male Northern Cardinal, and Other Gynandromorphs

The Biology of a Half-Female, Half-Male Northern Cardinal, and Other Gynandromorphs

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Jan. 30 2015 11:52 AM

The Gynandromorphs

A phenomenon observed in insects, crustaceans, and birds results in animals that are both female and male.

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Males and females of a species typically possess different sexual characteristics determined by their chromosomes, but sometimes, nature tosses a chromosomal curve ball. The video above explores gynandromorphism, most recently spotted in a striking northern cardinal in Illinois.

Correction, Jan. 30, 2015: A graphic in this video originally misattributed XX chromosomes to males and XY chromosomes to females. It also incorrectly suggested eggs can carry a Y chromosome. The video has been updated.