Birds are warm bodied creatures with wings and feathers. The body temperature of birds is generally higher than that of humans, so they seem warm to the touch. Birds lay eggs which they incubate until hatching -- or, in some cases, get some other bird to do the incubating. In some species such as our songbirds, the young hatch naked and helpless and must be fed and cared for by a parent bird. Others, like the chickens and their relatives, produce down-covered young that are able run about and feed themselves. They are still dependent for protection upon adult birds.
鸟有温暖的翅膀和羽毛。鸟类的体温一般高于人类，所以他们似乎是温暖的触摸。鸟产卵孵化，他们直到孵化-或者，在某些情况下，得到一些其他的鸟来孵化。在一些物种，如鸣鸟，年轻的孵化赤裸无助和必须被喂养和照顾父母的鸟。其他人，像鸡和他们的亲戚，产生的有盖的年轻，是能够运行和养活自己。他们仍然依赖于成年鸟类的保护。
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