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For a male duck to land a female, he must boast colorful plumage plus have an elaborate dance mating ritual and beautiful mating calls. This helps explain why duck vaginas are so elaborate and why duck penises have evolved to keep up — a kind of sexual evolution arms race called antagonistic coevolution. Many duck species skew male, meaning females can be pickier in their choice of mate. They are among the best endowed in terms of ratio of body to member of all vertebrates. Read Next Travel junkie sets out to make history on epic journey. To spread their seed, these ducks are upsetting the natural order of selection.

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