在这些濒危动物灭绝之前，我们必须保护它们。
We must protect these endangered animals before they become extinct.
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.
在过去几年间，许多动物灭绝了。
随着氧气浓度降低，海洋动物无法生存，因而大量动物灭绝。
With dwindling oxygen levels, Marine animals were unable to survive, wiping out large chunks of their population.
身高三英尺、拥有巨喙的渡渡鸟已经成为了“动物灭绝”的标志。
The dodo, a three-foot-tall flightless bird with a great big beak, has become a symbol of extinction.
关于造成这些大型哺乳动物灭绝的原因的争论主要放在了人类及气候上。
Debate over the cause of these extinctions has focused on the primacy of humans and climate in driving this dramatic loss of large mammals.
那时就发生了最近的一次海洋生物全球性大灭绝，在一些地方，有50%的深海动物灭绝了。
That was when the last globally significant extinction of Marine species took place, when 50% of some groups of deep-sea animals were wiped out.
吉尔表示，目前科学家还无法确定冰河时期动物灭绝的原因、以及为什么全球气候会发生骤变。
She said that scientists still aren’t sure why animals of the ice age died off, or why the world’s climate might suddenly warm and cool.
吉尔表示，目前科学家还无法确定冰河时期动物灭绝的原因、以及为什么全球气候会发生骤变。
She said that scientists still aren't sure why animals of the ice age died off, or why the world's climate might suddenly warm and cool.
科学家估计，每过24小时，就有150至200种植物、昆虫、鸟类和哺乳动物灭绝。
Scientists estimate that 150-200 species of plant, insect, bird and mammal become extinct every 24 hours.
迄今为止，这种猫鼬已经导致来自波多黎各、西印度群岛和牙买加的十二种爬行动物和两栖动物灭绝。
Themongoose has so far caused the extinction of 12 reptile and amphibianspecies from Puerto Rico, the West Indies and Jamaica.
根据数据分析，这个研究团队绘制出全球灵长类分布的地图，以及区域气候变化导致动物灭绝的分布地图。
Based on the data, the team created global maps that show where primates exist now and where climate change is predicted to cause die-offs.
就是因为有些动物身上的器官具有突出的经济价值，由此成为被人类掠夺利用的对象，成为动物灭绝的主要因素。
Is that some animals organ of the body with prominent economic value, thus become the object of human plunder, become the main factors of extinct animals.
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.
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.
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.
据他发现，人类不必大量捕杀这些动物，就可以使它们走向灭绝。
One thing he found was that humans didn't necessarily have to kill these animals in great numbers in order to nudge them toward extinction.
其中最著名的是1973年的《濒危物种法案》，该法案旨在保护濒临灭绝的动物物种。
The biggest was the Endangered Species Act of 1973, which protects imperiled animal species from extinction.
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.
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.
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.
恐龙灭绝受到巨大关注，但却没有多少人关注巨型动物，这让人感到诧异。
Given how much ink has been spilled on the extinction of the dinosaurs, it's a wonder that even more hasn't been devoted to megatauna.
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.
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.
灭绝也不仅仅局限于大型动物：小型动物、植物和昆虫的消失，或许不是全部都由于人类的食用而消失。
Nor were extinctions confined to large animals: small animals, plants, and insects disappeared, presumably not all through human consumption.
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.
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.
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.
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