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.
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.
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.
盖格尔和她的同事们研究了3200年前的骨头化石，这些骨头属于一种已经灭绝的叫做欧洲野牛的种类。
Geigl and her colleagues looked at 3200-year-old fossil bones belonging to a single individual of an extinct cattle species called an aurochs.
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.
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.
人们提出了许多关于恐龙灭绝的理论，但大多数都是不成立的。
Many theories have been put forward for the extinction of the dinosaurs, but most of them can be dismissed.
给你当地的环境保护中心写封信，表达你对动物迅速灭绝的感受。
Send a letter to your local environment protecting center and show how you feel about the quick extinction of animals.
这是一片充满了各种羚羊的土地——还有原牛，一种已经灭绝的牛。
This was a landscape where antelope of all kinds abounded—along with Bos primigenius, a kind of oxen that has become extinct.
人类有义务去拯救濒临灭绝的动物，因为它们的灭绝是我们的过错。
Humans have an obligation to try to save endangered animals, because it is our fault that they are going extinct.
濒临灭绝的亚洲象在中国享有一级保护，与大熊猫的保护级别一样。
The endangered Asian elephant enjoys Class-A protection in China, the same level as the giant panda does.
得知穿山甲正面临灭绝的危险，兰德勒迅速决定采取行动来保护它们。
Knowing that pangolins are facing the danger of dying out, Landon quickly decided to take action to protect them.
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.
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.
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