The giraffe is the tallest modern land animal.长颈鹿是现代陆地动物中最高的一种.It can be over 5.5 metres tall.它超过五米五高.
Its neck alone may be 1.9 metres long.仅脖子就可能有一米九长.
yet the giraffe has only seves bones in its neck,the same number as in the human.然而长颈鹿脖子部分只有七块骨头,这个数字和人类一样.
Even a small bird has many more bones in its than in a tall giraffe.即使一只小鸟脖子部位都长有更多的骨头.
Each bone in a giraffe's neck is very long,while the bones in a human neck are small.它脖子处的骨骼非常长,而人类脖子处的骨骼都非常小.
That makes the difference.这就形成了彼此间的差异.
A female giraffe give birth to one beby at a tine.母长颈鹿一次生一头小宝宝.
The baby,called a calf,is about 1.9metres tall at birth.幼仔初生时大约一米九长.
By the age of eight it has a long neck,it can reach the leabes high up on the trees.到它八岁时,它拥有长长的脖子能够吃到树木高处的叶子.
英国生物学家、生物进化论的奠基人达尔文认为,长颈鹿的长颈是自然选择的结果.古时候,长颈鹿的脖子有长有短.当遇到干旱的年代,地上的植物大都干枯了,剩下的也很快被动物们吃光了.而那些长颈子的鹿能吃到高处的树的叶子,就活下来了,短脖子的都死了.这样一来,留下来的都是长脖子的了.法国的生物学家拉马克的观点与达尔文的观点有着异曲同工之妙.他提出“获得性遗传“的理论.按照这个观点,生物界所有的性状都是与它生存的环境相关联的.为了适应环境,生物们努力地使用有用的器官,结果这些器官就发达起来；相反,长期不用的器官就萎缩了.按照这个理论,长颈鹿为了生存,在牧草稀少的干旱地区.必须取高大的树木上的叶子充饥,为此它就需要特别的努力伸长脖子.这样一代一代地延续下去,长颈鹿的脖子就逐渐长起来了.
翻译
British biologist,biological theory of evolution Darwin,the founder of the view that the long-necked giraffe is the result of natural selection.In ancient times,the giraffe's neck with a long short.When confronted with the era of drought,most plants on the ground dries up,the remaining animals also quickly eat up the.And those long necks to the height of the deer eat the leaves of the tree,it survived,and short neck were dead.In this way,left behind are of a long neck.French biologist Lamarck and Darwin's views have a similar perspective.He put forward the "acquired genetic" theory.According to this view,all biological traits are related to the survival of the environment it is associated.In order to adapt to the environment,biological their efforts to use a useful organ,the results of these organs on the developed together; the contrary,not long-term shrinkage of the organ.According to this theory,the giraffe in order to survive,forage scarce in arid regions.Must take on the tall trees to eat leaves,for it requires special efforts.This generation to continue,the giraffe's neck on a long gradual up.
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