A study found that 3 to 6 percent of examined wild birds in Australia showed intersex characteristics. Researchers compared genetic sex with reproductive anatomy in five bird species, discovering that misalignments between genes, gonads, and genitals occur in birds. This finding parallels known intersex conditions in mammals, where genetics and reproductive anatomy do not always correspond. In humans, approximately 1 percent are intersex, most commonly due to congenital adrenal hyperplasia, suggesting a broader spectrum of sex exists across species.
In a new study in Biology Letters, scientists examined nearly 500 wild birds from five Australian species... About 3 to 6 percent showed a mismatch.
This study shows that what biologists call the 'three G's'- genes, gonads, and genitals-don't always match, leading to broader understanding of intersex.
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