鸵鸟生活在非洲,是世界上最大的鸟,它们不能飞,但奔跑速度非常快。那么,它们那巨大的翅膀会有什么妙用呢?鸵鸟有的时候上下扇动翅膀来给自己降温。还有的时候它们会拍打翅膀来炫耀自己。雄鸵鸟和雌鸵鸟很容易区分,雄鸵鸟为黑色并长有一些漂亮的白色羽毛,而雌鸵鸟为灰色和棕色。 Ostriches live in Africa and are the largest birds in the world. They cannot fly but they run very fast. Then, what wonderful effect does their huge wings have? The ostrich sometimes flaps its wings to cool itself. Sometimes they will flap their wings to show off themselves. Male and female ostriches are easily distinguished. Male ostriches are black and have some pretty white feathers, while female ostriches are gray and brown.