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    雄性动物为交配拼尽全力,猫有带刺生殖器,鸭拥有螺旋形生殖器 - 知乎
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    The reproductive anatomy of ducks is quite unique and complex.
    • Male ducks possess large corkscrew-shaped phalluses, while female ducks have intricate vaginal tracts that have co-evolved in a "sexual arms race".
    • The reproductive system includes testes where sperm is produced, which then travels through the epididymis and vas deferens to the cloaca, a shared outlet for the reproductive, urinary, and digestive systems.
    • The anatomy has evolved due to their mating behaviors, making it distinct among avian species.
      This intricate reproductive system plays a crucial role in their mating and reproductive success.
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