边界粘土层被科学家用来确定一个灭绝物种衰落的速度。
Boundary clay layers are used by scientists to determine the rate at which an extinct species declined.
濒临灭绝物种的名单中列有将近600种鱼。
作为已灭绝物种或人类种族，尼安德特人与旧石器时代中期的工具有关。
An extinct species or race of human beings, Homo neanderthalensis, associated with Middle Paleolithic tools.
科学家称，环保人士对灭绝物种的数量估计过高。
Conservationists are overestimating the number of species that have been driven to extinction, scientists have said.
化石记录向人们出示了已灭绝物种存在过的证据。
The fossil record showed evidence of life forms that no longer existed.
通过比较腐鱼与化石的照片，研究人员能猜测出已灭绝物种的形状。
By comparing photos of rotting fish to fossils, researchers can guess what the extinct creature looked like.
不仅说话已经在我家消失了，手写体也成为濒临灭绝物种。
It's not just speech that is disappearing in our house. The handwritten word is an endangered species, too.
库克湾是白鲸的栖生地，这种鲸将有可能很快成为濒临灭绝物种。
The inlet hosts beluga whales, which could soon be added to the endangered species list.
约15%的哺乳动物物种和11%的鸟类物种被归类为濒临灭绝物种。
Around 15% of mammal species and 11% of bird species are classified as threatened with extinction.
如果狼群不受美国联邦制定的《濒临灭绝物种法》的保护，狼会消失吗？
Will wolves disappear again from the lower 48 states if they are not federally protected by the Endangered Species Act?
如果不实行联邦的《濒临灭绝物种保护法》那么48个周德狼是不是会灭绝？
Will wolves disappear again from the lower 48 states if they are not federally protected by the Endangered Species Act? (top)
随着竞争的加剧和食物的减少，北极熊已经成为气候变化所导致的濒临灭绝物种的典范。
With increased competition and less food, the polar bear has become the poster child for extinction threats caused by climate change.
现在我们已经远远超过了地球的承载能力，这也是为什么会有这样灭绝物种的事发生。
But we have now far exceeded earth's carrying capacity which is why we're in the middle of this major extinction.
各个物种的灭绝原因都不相同，而且找不到任何遗传特性来区别灭绝物种与存活物种。
The extinctions differ from species to species, and we don't find any common genetic characteristic to distinguish extinct from surviving species.
目前大量濒危物种灭绝危机的背后驱动力正是人类人口过多；以下是灭绝物种的比例。
Human overpopulation is the driving force behind the current mass-extinction crisis endangering.
尽管如此，巴诺维斯基教授还表示，现在解救这些濒危哺乳动物和其他濒临灭绝物种为时未晚。
Nevertheless, Prof Barnosky said it was not too late to save these critically endangered mammals and other such species.
大猩猩的四个亚种已经有三种被列为极度濒危，而第四种也已经上了世界自然保护联盟（IUCN）发布的濒于灭绝物种红色名单。
Three of the four gorilla subspecies are already considered critically endangered, and the fourth is listed as endangered on the IUCN Red List of Threatened Species.
科学家表示此项科技可用于提高畜禽品种质量和保护濒危灭绝物种，而更具争议的是，它或许将使得“男性之间实现生儿育女”成为现实。
The geneticists behind the controversial technique said it could potentially be used to improve livestock breeds or preserve endangered species.
成立这个协会是为了保护濒危物种不致灭绝。
The society was set up to preserve endangered species from extinction.
这些物种中的许多已经消亡或是正濒临灭绝。
Many of these species have vanished or are facing extinction.
大多数无脊椎动物在一次（物种）灭绝浪潮中消失了。
Most invertebrate species disappeared during a wave of extinctions.
物种灭绝、森林砍伐、河流筑坝、洪水、臭氧层损耗、海洋系统恶化和许多其他变化都在加速发生。
Species extinction, deforestation, damming of rivers, occurrence of floods, the depletion of ozone, the degradation of ocean systems and many other areas are all experiencing acceleration.
我相信你们都意识到了大量物种面临灭绝这个令人担忧的情况。
I am sure you're all aware of the worrying situation with a large number of species facing extinction.
由于引入了非本地的捕食者和病原体，已经有许多本土物种灭绝的记录，证据确凿。
There have been numerous well-documented extinctions of indigenous species caused by the introduction of non-indigenous predators and pathogens.
当一个物种灭绝时，它会极大地改变生物多样性的状况。
When a species goes extinct, it dramatically changes the landscape of biodiversity.
不管什么原因，恐龙以及地球上几乎半数以上的物种灭绝了。
Whatever the cause, dinosaurs, as well as about half of all species on the planet, went extinct.
据估计，大多数物种的灭绝可能是由于这些影响造成的。
According to some estimates, the majority of all extinctions of species may be due to such impacts.
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.
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.
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.
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