这些庞然大物都是孤独行者，特别是在现在的海洋里。过去，聚集成群往往是鱼类躲避掠食的方式，但现在这样却无异于自杀。
So being a loner is a great thing, especially in today's seas because schooling used to be salvation for fishes, but it's suicide for fishes now.
就如许多引进的物种一样，美国貂也能通过生态系统杀出一片生机，因为它们没有本土的天敌，而它们所掠食的物种还没有进化到可以躲避它们的掠食。
Like many introduced species, American mink can slash their way through the ecosystem, as they have no native predators, and their prey species haven't evolved to avoid them.
有时候，色彩的快速变换可以用来惊吓掠食者或威胁入侵者。
Sometimes a sudden shift in color can be used to startle potential predators or threaten intruders.
一种掠食动物经常大量捕食单单一种猎物时，这两个物种是紧密联系的。
When a predator always eats huge numbers of a single prey, the two species are strongly linked.
他发现，当掠食者的威胁逼近时，强侧化个体的进食速度是弱侧化个体的两倍。
He found that strongty-lateralised individuals were able to feed twice as fast as wealdy-lateralised ones when there was a threat of a predator looming above them.
外来掠食者最初不受自身掠食者的限制，它们可能会迅速繁殖并击溃预定目标。
Initially unrestrained by predators of their own, foreign predators are likely to be able to multiply rapidly and overwhelm intended targets.
她孵化出了具有强侧向或弱侧向的雏鸡，然后为这两组小鸡准备了隐藏在小鹅卵石中的食物，还制造出假的掠食者飞过头顶的威胁形状。
She hatched chicks with either strong or weak lateralisation, then presented the two groups with food hidden among small pebbles and the threatening shape of a fake predator flying overhead.
上龙用四根桨状的四肢推动它庞大的身体在水里游来游去，轻而易举地就能掠食形似海豚的鱼龙。
Using four paddle-like limbs to propel its bulky body through the water, the pliosaur made easy work of passing prey such as dolphin-like ichthyosaurs.
作为最残忍的掠食者之一，虎鲸可能不符合文明动物的形象。
As one of the most brutal predators, killer whales may not fit the image of a cultured creature.
温暖的环境给了克洛维斯人和他们的掠食对象种群繁荣的机会。
It was this warming that gave the Clovis people and their prey a chance to thrive.
界上最重要的海鸟繁殖地――南大西洋戈夫岛――现在正在受一种不像是掠食者的生物所威胁：常见的家鼠。
The world's most important seabird colony – Gough Island in the South Atlantic – is now being threatened by an unlikely predator: the common house mouse.
它的光芒能产生使海蜗牛看起来比实际大的假象，这种光芒使其呈现鲜艳的外表来吓退掠食者。
The light creates the illusion that the snail is bigger than it really is, giving it a glowing presence for warding off predators.
其中一种“巨刺金合欢（即牛角相思树）”学会了如何诱使一种蚂蚁为独占自己而杀死或驱赶其他的掠食者。
One, the "swollen thorn acacia, " learned to encourage a species of ant to monopolize it as a food source and kill or run off all other predators.
它们无论作为顶端掠食者还是过分捕捞的指示生物都在生态系统中扮演着重要的角色。
They can also have an important role in the ecosystem as top predators or as indicators of overfishing.
当像鲨鱼这样的顶级掠食者从环境中消失时，生态系统就会陷入混乱。
When top predators like sharks disappear from their environments, ecosystems fall out of whack.
设想一只动物，它必须去觅食，但同时也不得不保护自己免受掠食者的攻击。
Think about an animal. It has to get food, but at the same time it has to protect itself from predators.
这种能力在能够快速飞行的昆虫当中很常见，让昆虫们逃离掠食者的突袭以及免于飞行时与同伴分离。
The ability to see at high speed is common in fast-flying insects; allowing them to escape predators and catch their mates mid-air.
其实，若是在自然光下、于水中一段距离外，这种图案和色彩有助于扭曲鱼的轮廓，让它在潜在掠食者的视线中消失。
The pattern and colors actually help distort the fish's outline when seen in natural light at a distance through water, helping the animal disappear from the view of potential predators.
黑猩猩无疑是成功的掠食者，但它们种群之间的战争并非天性使然，多半是人类侵占它们的栖息地而导致。
Chimpanzees are undoubtedly successful hunters, but the "wars" seen between neighbouring bands seem to have been brought on by human encroachment on their habitat rather than original sin.
为了应对兔子问题，定居者们开始引进白鼬。白鼬是黄鼠狼家族的一员也是一个恐怖的掠食者。
So to deal with the rabbit problem, settlers introduced stoats - a member of the weasel clan and a terrific predator.
这些老鼠的掠食对象当中还有信天翁的幼鸟，这种幼鸟的体重约是老鼠的300倍。
Among their prey are albatross fledglings, which weigh some 300 times as much as the mice.
不久之后，美国的“掠食者”侦察机和地面搜查人员又被调往伊拉克执行任务。
Soon afterwards, America's robot Predators and human manhunters were dispatched on another assignment, to Iraq.
卡普奇诺和阿纳森猜测，这可能是因为土生土长的掠食者对外来物种所具有的防御机制有时产生“预适应”，有时又不产生。
Dr Cappuccino and Dr Arnason suspected this might be because native predators are sometimes "pre-adapted" to the aliens' defences, but in other cases they are not.
格陵兰海豹主要生活在冰上，并且在冰上产崽。这么做，部分原因是出于躲避陆地上的掠食者。
Harp seals make ice their main habitat, and they give birth on ice, partly as protection from predators on land.
超级鳄有可能因为太重而不善于奔跑，因而它可能会潜伏在水底，掠食甚至更大的动物。
And SuperCroc, which was probably too heavy to run, and which probably lurked at the water's edge, could have taken even bigger ones.
狼是农场主必须面对的众多掠食者之一，他们还有对付山狗、山狮和家狗。
Wolves are one of many predators ranchers face, including coyotes, mountain lions, and domestic dogs.
城市是一个掠食资源的老饕。
城市是一个掠食资源的老饕。
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