Female ducks have evolved an intriguing way to avoid becoming impregnated by undesirable but aggressive males endowed with large corkscrew-shaped penises: vaginas with clockwise spirals that thwart oppositely spiraled males.
I love this article because it shows how effective evolution can be. It's interesting that there is a power struggle over which sex controls the mating frequency in ducks, and an evolutionary change like this can give shift the power from male to female. But in general, i love the article because it's an all around interesting topic.
I love this article because it shows how effective evolution can be. It's interesting that there is a power struggle over which sex controls the mating frequency in ducks, and an evolutionary change like this can give shift the power from male to female. But in general, i love the article because it's an all around interesting topic.
I think this is an intresting article, because female geese have the abilty to reject a males sperm. its like selection of offspring and only the fittest survive
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