报告称这些动物的种群数量在短短四十年内下降了52%。
The report says these populations have dropped by 52 percent in just 40 years.
另一个指标，地球生命指数，是1 686种脊椎动物的种群数量变化的平均数。
Another indicator, the Living Planet Index, averages changes in the sizes of populations of 1, 686 vertebrate species.
我在这里发现，食草哺乳动物的种群密度与生物量，堪与状况最好的东非大草原地区相比。
I determined that densities and biomass of herbivorous mammals in Nagarahole were comparable to some of the best East African Savannah areas.
如果，正像我们人类要控制自己的种群一样控制各种动物的种群数量，那么，我们既保护了它们，也可以少点儿麻烦，少点儿死亡，少点儿悲哀。
If we can control the amount of animal RACES as well as we control our population, then we both can protect animals and can be less trouble, less dead and less sad.
此外，肮脏、拥挤的住所促进疾病在许多动物种群中扩散，这实际上是昆虫对居住地方的选择。
Furthermore, the squalid, cramped quarters that encourage diseases to propagate among many animal populations are actually the residental choice for insects.
这进而对它们的饮食产生了重大影响，促使科学家们推测，学习特定种群狩猎方法的能力可能推动了这些动物的基因发育。
This, in turn, has a major effect on their diet, leading scientists to speculate that the ability to learn population-specific hunting methods could be driving the animals' genetic development.
例如，岛屿通常没有大型食肉动物的殖民地，或者太小而无法容纳可行的食肉动物种群。
For instance, islands often have not been colonized by large predators or are too small to hold feasible predator populations.
这种辩护导致了一个过于草率的结论，即运动狩猎能产生更健康的动物种群。
This defense leads to the overly hasty conclusion that sport hunting produces a healthier population of animals.
但是当你所属的种群人数众多时，就不能整个种群一起追踪一群野生动物。
But when you have a large population, well, the whole population can't just get up and move to follow a wild herd of animals.
比如说，像小鹿或者山羊这种被捕食的种群，它们的代表动作就是突然快速逃跑的动作和突然转弯；相反的，猫科动物之类的捕食种群会练习潜行追踪、猛扑和撕咬等动作。
Prey species, like young deer or goats, for example, typically play by performing sudden flight movements and turns, whereas predator species, such as cats, practice stalking, pouncing, and biting.
人类被定义为一种理性的存在，一种群居动物，一种可以制造工具的动物，或者一种制造符号的动物。
Man was defined as a rational being, as a social animal, an animal that can make tools, or a symbol-making animal.
在瑞士，只养一条金鱼是不允许的，因为政府认为让这种群居动物独自生活是非常糟糕的。
In Switzerland, keeping only one goldfish isn't allowed, because the government believes it is very bad to make such social animals live alone.
比如，他们需要解释动物种群为什么会受到降雨量变化的影响，以及可以采取何种预防措施。
They need, for example, to explain "why an animal population is affected by changes in rainfall, and what might be done to protect it."
该地区的农民们注意到了沼泽地生产力的重大下降，以及随之而来的干旱使得大量动物种群迁出。
Farmers in the area have seen a significant decline in the marsh's productivity as successive droughts have driven away many animal populations.
这种与世隔绝的状态使得有袋动物种群安全地进化了几千年。
The very word connotes isolation — an isolation that has allowed pockets of animal species to evolve in safety over the course of thousands of years.
这些，连同其它人工养殖的动物（其它动物的养殖也必须为其野生种群的保护提供资金）每年为该州的财政收入贡献达2千万美元。
These, together with farmed animals (farms must also contribute financially to the wild population) generate $20m in revenue for the state every year.
从鼠类到实蝇的短寿命生物科学研究支持这一观点。 但通过对比人类与其他灵长类动物的首个多种群衰老形式后发现，人类的衰老速度与他无异。
This belief was upheld by scientific studies of short-lived creatures ranging from rats to fruit flies.
这对关于表皮图案的另一理论解释是当头一击，此种解释认为斑点是同一动物种群的共有标记形式。
That knocks on the head an alternative explanation for coat patterns, namely that spots are some form of signal between animals of the same species.
然而动物学家都清楚，实验提供的依据再多，最终也还是要看自然种群。
But as all zoologists know, experiments can only tell you so much. Eventually, you have to look at natural populations.
有些地方动物种群是水平分布的，比如在索尔兹伯里平原，这块冰碛沉积三角洲密集分布着王企鹅、软毛海豹、象海豹和黑背海鸥。
Sometimes the animal multitudes are horizontal, as on Salisbury Plain, a glacial outwash delta densely colonized by king penguins, fur and elephant seals, and kelp gulls.
他目前的研究范围从研究鲑鱼的动态系统和鳕鱼种群数量到建造植物和动物物种应对全球气候变化的模型。
His current studies range from researching the dynamics of salmon and cod populations to modeling plant and animal species' response to global climate change.
各式各样的珊瑚生活在这里，活动在其间的不乏特有的动物种群。
A whole different set of corals live down here-and with them come a specialised fauna.
接着，这些科学家搜罗了世界各地的科学文献，联系了世界各地的爬虫学家，来观察动物种群的结局如何。
The scientists then scoured the scientific literature and contacted herpetologists around the world to see how the animal populations had fared.
报告涵盖了365种物种的965个种群，相当于北极地区所有已知的脊椎动物物种的35%。
It covers 965 populations of 365 species, representing 35 percent of all known vertebrate species found in the Arctic.
他目前的研究范围从研究鲑鱼的动态系统和鳕鱼种群数量到建造植物和动物物种应对全球气候变化的模型。
His current studies range from researching the dynamics of salmon andcod populations to modeling plant and animal species' response toglobal climate change.
岛上物种群体包括在其它地方找不到的70种狐猴，其它哺乳动物占约90%，在其宽达226,656平方英里的土地上，两栖动物和爬行动物是稀罕独特的。
The island's population includes 70 kinds of lemurs found nowhere else and about 90 percent of the other mammals, amphibians and reptiles are unique to its 226,656 square miles.
岛上物种群体包括在其它地方找不到的70种狐猴，其它哺乳动物占约90%，在其宽达226，656平方英里的土地上，两栖动物和爬行动物是稀罕独特的。
The island's population includes 70 kinds of lemurs found nowhere else and about 90 percent of the other mammals, amphibians and reptiles are unique to its 226, 656 square miles.
科学家发现，我们最亲近的某些动物亲戚——猴子——对种群中年长成员的关注高于对年轻成员关注。
Scientists found that some of our closest animal relatives – monkeys – pay more attention to the older members of a group than they do to youngsters.
在一些丝类研究者看来，如果蜘蛛是一种群居的素食性动物，那世界肯定会变成另一副模样。
As some silk researchers see it, if spiders were gregarious vegetarians, the world might be a different place.
受气候变化影响最大的动物种群可能是狼獾——一种以其神奇的力量和韧性闻名的残暴的捕食者，现实中的金刚狼。
The charismatic megafauna suffering most from climate change may well be the wolverine—a vicious predator known for its uncanny strength and tenacity.
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