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Patricia Brennan from Yale University is trying to encourage male Muscovy ducks to launch their ballistic penises into test tubes. Normally, the duck keeps its penis inside-out within a sac in its body.

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The whole process takes just a third of a second and Brennan captures it all on high-speed camera. Duck penises are a wonderful example of the strange things that happen when sexual conflict shapes the evolution of animal bodies. Many ducks form bonds between males and females that last for a whole mating season.

But rival males often violently force themselves onto females.

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To gain the edge in these conflicts, drakes have evolved large corkscrew phalluses, lined with ridges and backward-pointing spines, which allow them to deposit their sperm further into a female than their rivals. But female ducks have developed countermeasures. Their vaginas are equally long and twisting, lined with dead-end nude girls taking pics of themself and spirals that curve in the opposite direction. Two years ago, Brennan showed that duck species whose males have the longest penises tend to have females with the most elaborate vaginas.

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Now, she has found further evidence that these complex genitals are the result of a long-lasting war of the sexes. Duck penises and those other birds work in a different way to human ones.

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For a start, they are flexible when erect. That presents a problem. You need to give it something to have sex with.