Hesperornis is an extinct genus of flightless aquatic birds that lived during the Late Cretaceous.

黄昏鸟是一已经灭绝不会翔水鸟，生活在白垩纪晚期。

The penguin is a flightless bird.

企鹅是一不会鸟。

In some species, such as aphids, the flightless morph lacks wings and is called the apterous morph.

一些昆虫，蚜虫，出现无翅个体，被称为无翅型。