他们已经把犀牛逼到了灭绝的边缘。
它们将成为第二大灭绝的鸟类。
They will tum out to be the second-largest species of birds to become extinct.
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.
让我们以现在已经灭绝的美洲猎豹为例。
我们都知道熊猫是一种濒临灭绝的物种。
We all know that panda is a species that is on the edge of extinction.
在这种假设下，大灭绝的发生是非常突然的。
The mass extinction would have occurred very suddenly under this hypothesis.
这在导致整个鲑鱼种群灭绝的案例中最为明显。
This is most evident in cases where it results in the extinction of entire salmon populations.
一旦森林覆盖开始增加，灭绝的速度应该变小。
Once forest cover does start increasing, the rate of extinction should dwindle.
一种理论是，它们是由于人类的猎杀而灭绝的。
One theory is that they were hunted to extinction by humans.
为什么科学家们想要了解更多关于恐龙灭绝的信息？
Why did scientists want more information about the dinosaur extinctions?
如果你仔细想想，这第六次大灭绝的核心问题是人类的干扰。
If you think about it though, the core problem with this sixth mass extinction is human interference.
多种动植物濒临灭绝的危险，所以我们必须行动起来保护它们。
Many species of plants and animals are in danger of extinction, so it's high time that we take actions to protect them.
研究人员要求五年级学生和大学生制定一个保护秃鹰免于灭绝的恢复计划。
The researchers asked fifth graders and college students to create a recovery plan to protect bald eagles from extinction.
人们对恐龙灭绝的传统解释感到不满，导致了一个令人惊讶的发现，转而引发了新的假设。
Dissatisfaction with conventional explanations for dinosaur extinctions led to a surprising observation that, in turn, has suggested a new hypothesis.
有些种类甚至面临灭绝的危险。
公园里的麋鹿有灭绝的危险。
这些活动使那些濒临灭绝的语言有了活力。
一百万年前，我们基本上是濒临灭绝的物种。
A million years ago, we were essentially an endangered species.
最近，濒临灭绝的地中海僧海豹出现了惊人数量的死亡。
An alarming number of Mediterranean monk seals, an endangered species, have recently died.
现今物种灭绝发生的速度和这些大规模灭绝的速度一样快。
The rates of extinction happening today are as great as the rates during these mass extinctions.
许多物种在地质上很短的时间间隔内灭绝的情况称为大灭绝。
Cases in which many species become extinct within a geologically short interval of time are called mass extinctions.
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