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

黄昏鸟是一种已经灭绝的不会飞翔的水鸟，生活在白垩纪晚期。

The penguin is a flightless bird.

企鹅是一种不会飞的鸟。

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

一种类，如蚜，出现无翅个体，被称为无翅型。