For instance, islands often have not been colonized by large predators or are too small to hold feasible predator populations.
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。
Large predators were sustained by populations of prey fish, pilchards, herring, sprat and others, far greater in abundance than those present today.
大型食肉动物是靠猎物鱼，沙丁鱼，鲱鱼，鲱等来生存的，大大的比现在的数量种类丰富。
Now a study in the journal Science shows the impact of this wholesale elimination of large predators and other animals at the top of local food chains. James Estes et al.
如今，《科学》杂志的一项研究表明了大型肉食动物以及其他食物链顶端的动物大规模消失所带来的影响。
All that movement makes it hard for predators to see individuals in a large group.
所有这些运动使得捕食者很难在一个大群体中看到个体。
Now they want to burn large sections of the forest, to clear it of predators.
现在为了清理捕食者，他们要燃烧大片森林。
The fearsome ichthyosaur was one of the very earliest large sea predators.
长相吓人的龙鱼曾是最早的海洋食肉动物之一。
Top predators are key to keeping populations of key species from growing too large.
大型捕食者是使主要的物种种群不会生长过大的关键因素。
"Spiders are key predators of insects and can alleviate the need for farmers to spray large quantities of pesticide," Reynolds said.
“蜘蛛是昆虫的天敌，有了它能避免农民大量喷洒杀虫剂”，雷诺兹说。
Brancato says skunk populations can grow large because they don't really have any natural predators.
布兰·卡多表示，由于臭鼬在自然界没有任何天敌，它们的数量就会增加到很多。
That relationship, however, is just a coincidence caused by the fact that small beasts usually have more predators than large ones do.
但这种关系只是一种巧合：小动物的天敌通常都远多与大动物。
On large expanses of land, big animals do best, because they are less vulnerable to cold and less likely to be attacked by predators.
在面积宽阔的陆地上，体型大的哺乳动物生存地最好，因为和体积小的动物相比，他们更少受寒冷伤害，被食肉动物袭击的机率也小。
Like other dinosaurs, they are thought to have grown to a large size quickly after hatching. Until then, they would have been highly vulnerable to predators such as Sanajeh indicus.
正如其他恐龙一样，他们在出生以后身体就急速得成长到较大的体型，如此他们才能避免在再受到Sanajehindicus此类捕食者的侵害。
Silversides swirl through mangroves in the coral reefs off Cuba. The finger-size fish form large schools to try to confuse predators.
在古巴珊瑚礁，银河鱼们以旋涡状穿过红树林。这些手指大小的鱼儿们成群结队以此来迷惑捕食者。
However making noise is considered a necessary safety precaution in many areas home to large wild animals, especially predators such as bears.
不过，制造噪音在一些大型动物，特别是食肉动物(比如熊类)的栖息地，是必要的安全预警行为。
In particular, the large and rich colonies of honeybees are a very rewarding target for a great variety of predators and parasites.
在自然界中，动物所面临的生存威胁主要来自于捕食者和寄生生物。
Only widely occurring predators, such as the orca (a large predatory whale), could have the same effect, but orcas prefer to hunt much larger prey, such as other whales.
除此之外，只有像逆戟鲸（一种大型肉食鲸）那种食性广泛的动物才能通过捕食呈现相同的效果。但是，逆戟鲸更喜欢捕食像鲸类这种的大型猎物。
The teeth of these fleet-footed predators are too small to use as daggers for large kill, but the cats have strong jaws that lock around the throat of prey until the victim stops breathing.
这些敏捷的掠夺者们的牙齿在大型猎物面前就像匕首一样显得太小，但是猫科动物强壮的颚能够环锁住猎物的喉咙直至受害者停止呼吸。
Silversides swirl through mangroves in the coral reefs off Cuba. The finger-size fish form large schools to try to confuse predators.
银汉鱼在古巴外珊瑚礁区的红树林中打转穿梭。这些手指大小的鱼儿结成巨大的鱼群，以蒙蔽捕猎者。
Pliosaurs were the top Marine predators during a time when the oceans were teeming with large, meat-eating reptiles.
在海洋中充满庞大的食肉动物的那个时期，上龙是它们的霸主。
The finger-size fish form large schools to try to confuse predators.
这些手指大小的鱼儿结成巨大的鱼群，以蒙蔽捕猎者。
The world's largest living tortoises are an icon of evolution, growing so large on the isolated islands because of the absence of natural predators.
世界上现有的最大乌龟是进化的最好诠释，它们能长到如此之大是由于生活区不存在天然的猎手。
Mainly, large ears can detect even the smallest of sounds such as approaching predators and of course, the presence of live food.
耳朵主要的用途是能够侦听到甚至是最微弱的声响，比如食肉动物的接近，当然也包括猎物活体的所在位置。
Or we might simply habituate prey to large noisy animals—like us—and thus render them more susceptible to predators later.
或许我们只是习惯了发出嘈杂声响的大型动物，而这会让它们更容易受到捕食者的影响。
Or we might simply habituate prey to large noisy animals—like us—and thus render them more susceptible to predators later.
或许我们只是习惯了发出嘈杂声响的大型动物，而这会让它们更容易受到捕食者的影响。
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