唯一明确的解释是人类的过度捕猎导致了各种哺乳动物的灭绝。
The only clear explanation is that humans caused the extinction of the various mammal species through excessive hunting.
寒武纪大爆发涉及迅速的进化分化，随之而来的是许多独特动物的灭绝。
The Cambrian explosion involved rapid evolutionary diversification, followed by the extinction of many unique animals.
一个方法是通过提供新的避难所、新的栖息地来帮助防止一些濒危巨型动物的灭绝。
One is to help prevent the extinction of some endangered megafauna by providing new refuges, new habitats for them.
有时依法反而更糟，可能变相加速动物的灭绝。
动物园一起努力来阻止动物的灭绝。
Zoo are working together to stop animals from going extinct.
文中提到大型史前动物的灭绝是为了说明。
The extinction of large prehistoric animals is noted to suggest that.
这种动物的灭绝是由于他们栖息地的改变。
The extinction of this kind of animals was due to the alternation of habitat.
动物园正在一起行动（去）阻止动物的灭绝。
Zoos are working together to stop animals from going extinct.
此刻人们似乎还没有意识到一种动物的灭绝的风险。
Now seems to have been aware of the extinction of an animal hazards.
现在人们似乎还没有意识到一种动物的灭绝的危害。
Now seems to have been aware of the extinction of an animal hazards.
许多野生动物的灭绝归因于人类对它们的大肆捕杀。
The extinction of much wildlife can be attributed to the fact that humans take a staggering toll on it.
许多人想当然地认为一种植物或动物的灭绝产生的后果很小。
Many people assume that the extinction of a plant or animal species is of little consequence .
许多人想当然地认为一种植物或动物的灭绝产生的后果很小。
Many people assume that the extinction of a plant or animal species is of little consequence.
研究者表明：“长毛象以及其他一些大型的冰期动物的灭绝不应归咎于‘人类的袭击’。”
The extinction of the woolly mammoth and other large ice age animals can't be blamed on a 'human blitzkrieg', say researchers.
科学界中，普遍接受的观点认为，大型爬行动物的灭绝是由巨型陨石对墨西哥尤卡坦海岸的冲击引起的。
The idea that the giant reptiles met their demise because of a gigantic meteorite impact off the Yucatan coast of Mexico has become one of the most widely accepted in science.
我们知道，这些物种大多数是顶层食肉动物，而顶层食肉动物的灭绝通常会对这个生态系统造成不良后果。
We know that most of these species are top predators and we know that removing the top predators usually has negative consequences to the system as a whole.
珊瑚和依靠这些珊瑚生存的动物的灭绝不止仅仅对于渔业造成威胁，从地球物理的角度来看，生态系统是一个严密的生物组织体系，她规定着营养和能量的转化和流动。
The loss of corals and the animals that depend on them doesn’t just threaten fishing. From a geophysical perspective, ecosystems are biological mechanisms that regulate flows of nutrients and energy.
这些动物由于遭到无情的捕猎而濒于灭绝。
The animals were ruthlessly hunted to the verge of extinction.
为什么会发生野生动物濒临灭绝和迁徙的现象？
Why did the near extinction and migrations of wild animals occur?
在研究灭绝的动物时，总要做一些猜测。
There's always some guesswork when studying extinct animals.
化石记录表明，在地球有动物居住的所有时期，已经有五次大灭绝发生，恐龙是最近的一次。
The fossil record indicates that in all the time that animals have inhabited Earth, there have been five great mass extinctions, dinosaurs being the most recent.
科学家正试图把已灭绝动物的特征与现存类似动物相比较。
Scientists are attempting to compare features of extinct animals with living analogues.
这可能导致我们进入一个恶性循环，即越来越多的植物和动物也濒临灭绝。
This can lead us on a downward spiral with more and more plants and animals becoming endangered as well.
同样，如果一种植物或动物没有留下任何可以繁殖的后代，它就不能把所有的能量浪费在使自己变得更强壮上，因为这是最可能走向灭绝的方式。
Similarly, a plant or animal cannot squander all its energy on growing a big body if none would be left over for reproduction, for this is the surest way to extinction.
如果这些大型猫科动物灭绝了，那么它们捕食的小型动物将会使森林中物种的密度过高。
If these great cats become extinct, the smaller animals they prey upon will overpopulate the forests.
当史前人类来到一处新地方时，一些奇怪的事情发生在大型动物身上，那就是它们突然灭绝了。
When prehistoric man arrived in new parts of the world, something strange happened to the large animals: they suddenly became extinct.
一种罕见的树蛙，泥鱼和蜥蜴都在成千上万种濒临灭绝的动物之中。
A rare tree frog, a mudfish and lizards are among the thousands of species threatened by extinction.
海龟、北极熊和大熊猫只是世界上成千上万濒临灭绝的动物中的一部分。
Sea turtles, polar bears and giant pandas are just some of the thousands of animals in this world that are at risk of extinction.
伯吉斯页岩地层中也有许多代表着现代动物群中已经灭绝的物种的化石。
The Burgess Shale formation also has fossils of many extinct representatives of modern animal groups.
人类学家谢泼德·克雷奇指出，即使在没有证据证明古印第安人猎杀大型动物的地区，大型动物也灭绝了。
Anthropologist Shepard Krech points out that large animal species vanished even in areas where there is no evidence to demonstrate that Paleoindians hunted them.
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