Why did the majority of bird species evolve to lose their penises?
In short: Most birds reproduce without a penis, relying on internal fertilization instead. This video explores the evolutionary theories behind this anatomical shift, questioning whether it was driven by natural selection, sexual selection, or a trade-off for other biological advantages.
While internal fertilization is standard for birds, the vast majority have abandoned the use of a penis. This anatomical change suggests that the organ is not a biological requirement for successful reproduction in avian species.
Researchers consider several evolutionary drivers for this loss. It may have been an accidental development, a result of sexual selection, or a consequence of natural selection where the loss of the organ provided a different, more useful advantage to the birds.
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- Summary by Intellect · source: Why Did the Rooster Lose Its Penis?
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