No.8 海豚

　　其实海豚的牙齿并不是为了咀嚼的;它们生来就是为了战斗用的。不过大多数时候，海豚给我们的印象都是可爱温和。

　　Although all dolphins are equipped with teeth not all species use their teeth for eating prey or tearing flesh.

　　Depending on the dolphins species some dolphins (such as the killer whale) will use their teeth to rip apart the flesh of their prey in order to kill it and make it easier to consume while species (such as the bottlenose dolphin) only use their teeth to grip their prey but will consuming their food whole.

　　尽管所有的海豚都有牙齿，但并不是所有的海豚家族成员都用牙齿来捕食或撕裂肉。

　　一些海豚物种(如虎鲸)会用牙齿扯破猎物的肉来杀死它,并且更方便食用;而另一些如宽吻海豚则只会用牙齿抓住猎物，因为它们会把这些猎物直接整个吃掉。

　　No.9 蓝鲸

　　如果一座蓝鲸在哭泣，它的哭声可以比一架飞机的引擎声还要响亮。

　　Whales produce crying sounds or sad whale songs when they feel sad, alone or upset, which allows other whales and marine mammals to know how they feel and gives them the ability to express their emotions whether they are alone or around other whales.

　　Whales can often be seen or heard crying or moaning when they have recently lost a loved one or when they feel alone and haven’t found a friend or partner to connect with.In fact some whales such as the blue whale can produce deep vocal sounds that are so loud they can be heard from miles away.

　　当鲸鱼感到悲伤、孤独或沮丧时，它们会发出哭泣的声音，又或者是悲伤的鲸鱼之歌。这让其它的鲸鱼和海洋哺乳动物知道它们的感受、并使自己能够表达情绪，不管它们身边是否有人。

　　当它们失去了一个爱人，或者当它们感到孤独，没有找到一个朋友或伴侣的时候，它们经常会被看见或听到哭泣或呻吟。事实上，一些鲸鱼，比如蓝鲸，可以发出巨大的声音，声音如此之大，从几英里外就能听到。

　　No.10 兔子

　　在野外，兔子的存活率非常低。平均7只兔子中只有1只能存活到成年。

　　兔子可以看清一切在周围的事物，除了它们的鼻子底下——这是它们的“盲区”。

　　No.11 鸭子

　　在小鸭子刚出生十分钟左右，它会把睁开眼睛看到的任何事物当作自己的妈妈。

　　What's amazing is that researchers have discovered that young birds imprint themselves to the first moving thing they set their eyes on - even if they are inanimate objects.

　　The downside of imprinting is that young animals have a hard time detaching themselves from their adopted 'mother'. That means that they are often unable to return to the wild or socialize with their own species.

　　研究人员有了一个令人惊奇的发现：幼鸟会专注于自己睁开眼睛看到的第一个移动的物体上——即使这个物体并不是生物。

　　这个生物学中的“印随效应”的缺点是，幼崽将很难从它们的“养母”身边离开。这也意味着，它们往往不能回到野外或者自己的种族中，与同类进行正常的社交活动。

　　No.12 大象

　　大象能发出很多种声音，而有趣的是，大部分的声音人耳都是听不到的。

　　The human ear can hear many elephant sounds, but an intriguing fact is that some of their vocalizations are infrasonic, and thus are inaudible to humans. Sounds are generally considered infrasonic if their frequency is less than 20 Hz (the lower limit of human hearing).

　　人类的耳朵能听到许多大象的声音，但一个有趣的事实是，它们的某些发声是次声的，因此对人类来说是听不清的。如果频率小于20hz(人类听力的下限)，声音通常被认为是次声。

　　No.13 长颈鹿

　　长颈鹿宝宝刚出生时就要经历一次挑战：它生命的开始，是从距离地面6英尺(约1.8米)的地方掉下来。

　　Giraffe mothers are pregnant for 15 months, giving the embryo time to develop to such a large size, and when ready to come out, the baby comes front feet first, with the neck and head stretched out over the front knees in a sort of "superman" position.

　　This comes in handy because a mother giraffe gives birth in a standing position, which means the newborn comes into the world falling from a height of over 5 feet.

　　长颈鹿妈妈怀孕15个月，给胚胎足够多的时间，发展到如此大的尺寸。当新生的宝宝准备出来的时候，它们的前脚先着地，脖子和头部在前膝盖上伸展出一种“超人”的姿势。

　　其实这样的姿势很方便，因为长颈鹿妈妈在生产的时候是站立的，这也就意味着新生儿从超过5英尺(约1.5米)的高度进入了世界。

　　No.14 老鼠

　　老鼠是可以感知到同伴的悲伤的。而这也会让它们变得悲伤起来。

　　No.15 绵羊

　　绵羊只能记得住50张脸。