vertebrate genitalia

  • When Male Ducks Hang Out Together Their Dicks Get Longer

    When Male Ducks Hang Out Together Their Dicks Get Longer

    A male and female Lesser Scaup. (Image: Kurt Bauschardt/Flickr) Male ducks have some of the weirdest junk in nature — a ludicrously long, corkscrew-shaped member that evolved on account of an ongoing battle of the sexes. New research shows that the social environment in which the male duck finds himself in has a pronounced effect…