For instance, males are extremely rare in some groups of the African butterfly Acraea encedon and of the widespread pill bug Armadillidium vulgare (also called a wood louse).

• 例如非洲细蝶（Acraeaencedon）的某些族群中，雄性极为稀少，分布广泛的鼠妇（Armadillidiumvulgare；又叫木虱）也是。