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You are here: Home / Yes, Animals Can Be Half Male and Half Female

Yes, Animals Can Be Half Male and Half Female

February 14, 2019 by

Gynandromorph of a Common Blue (Polyommatus icarus) butterfly. Wikimedia Commons Earlier this year, a sighting of a rare cardinal thrilled countless birdwatchers when it appeared in a Pennsylvania backyard. The bird, whose plumage was split practically down the middle — one side a cherry-red, the other a soft mix of yellow and brown — is a type of animal known as a gynandromorph. Although they sound like something straight out of a sci-fi novel, gynandromorphs are very real — if not entirely common. These animals are unique because they exhibit both male and female physical traits. More specifically, this colorful cardinal is a bilateral gynandromorph, meaning that one side of the body takes on female secondary sex characteristics, and the opposite side the male characteristics. Although reproductive organs do sometimes match up with the sex-specific physical features — i.e., ovaries appearing on the female side and testes on the male side — this is not always the case. You might also refer to this creature as a “sexual mosaic” or a type of male-female chimera. Chimera is a word that has its roots in Greek mythology and refers to a being who carries two separate sets of DNA. Dating back to at least the 1800s, scientists have observed gynandromorphs in nature. They’ve been especially well-observed in insect and crustacean populations. Among vertebrates, gynandromorph birds — known as half-siders among avian enthusiasts — have received the most attention. But how do these gynandromorphs form? Long-standing scientific theories have focused on the…


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