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Is a penguin a bird?

企鹅是鸟吗？

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This problem arises because we often see these creatures swimming underwater or stumbling clumsily through the cold wilderness of Antarctica: penguins can't fly, and we usually associate birds with soaring in the air. However, in zoological terminology, penguins are classified as birds. They are flightless black and white seabirds, belonging to the family Butterfly, which live in the southern hemisphere, mainly in the Antarctic (although several species live in more temperate areas).

Like other birds, penguins have feathers, lay eggs and are warm-blooded animals. Through the process of evolution, the wings of penguins gradually adapted to become flippers for swimming. Compared with other birds, penguins' feathers are relatively short and hard, and they overlap closely to form a thick smooth layer, which restricts the air below, thus providing a cold protection.

和其他鸟类一样，企鹅也有羽毛，会产卵，是温血动物。在生物进化过程中，企鹅的翅膀逐渐退化为鳍状肢，主要用于游泳。与其他鸟类的羽毛相比，企鹅的羽毛相对较短、较硬，而且相互重叠。

形成了一层又厚又滑的保护层，隔绝了羽毛下的空气，从而起到了防寒的作用。

Other flightless birds include Australian emus, New Guinea cassowaries and ostriches. Unlike penguins, they are more obviously feathered and live on land, so we probably won't question the fact that they are birds.

其他不会飞的鸟类包括澳大利亚的鸸鹋、新几内亚的食火鸡和鸵鸟。与企鹅不同，这些鸟有明显的羽毛，生活在陆地上，所以我们不质疑它们是鸟的事实。

澳大利亚鸸鹋

新几内亚食火鸡

非洲鸵鸟

Definition of Penguin

企鹅的定义

Penguin is a large black-and-white seabird, which mainly lives in Antarctica. Penguins can't fly, but they swim with short wings

柯林斯在线词典：企鹅是一种大型黑白海鸟，主要生活在南极圈。企鹅不会飞，但是它们能用它们的短鳍游泳。

So, a penguin ISa bird!

所以企鹅是鸟类。

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