All species face the problem of attracting mates.Male bowerbirds build ornately decorated bowers, male hangingflies offer captured prey, and male sedge warblers sing a wide repertoire of songs.

• 所有的生物都必须面对求偶问题，雄性的园丁鸟会筑华美的鸟巢，雄性蚊蝎蛉会贡献捕捉到的猎物，雄性水蒲苇莺会高唱许多情歌；