Male stalk-eyed flies have exaggerated ornamentation in the form of the eyestalks when compared to females (figure below). While males also have larger wings, this is most likely to compensate for the increased energetic cost of flying with the larger ornaments.
If you aren’t familiar with the stalk-eyed fly, then watch the video below to see how the stalks develop.
Video Credit: BBC’s Life series with David Attenborough
Check out this link to learn more about current research from Dr. Jerry Husak.