当树中空或部分死亡时，它为小动物提供了一个家，也成为了许多其他动物的食物来源。
When a tree becomes hollow or part of it becomes dead, it provides a home for small animals and is a source of food for many other animals.
根据素食者对源自动物的食物的态度，他们可划分成如下几类。
Vegetarians fall into groups defined by the types of animal-derived foods they eat.
由此你可以看到植物的食物与动物的食物在哪些方面有所区别。
Here, then, you see in what ways the food of the plant is different from that of animals.
这些灵长类动物的食物包括水果、树叶和昆虫，它们很少会到地面上来。
The primates eat fruit, leaves, and insects and rarely descend to the ground.
任何源自动物的食物都不会出现在他们的餐桌上，如肉，家禽，鱼，奶，鸡蛋及奶酪。
They don't eat foods from animals, including meat, poultry, fish, milk, eggs and cheese.
细菌通常情况下栖居在温血动物(比如家禽和牛)的肠道内，并且经常在源于这类动物的食物中发现。
The bacteria normally inhabit the intestinal tract of warm-blooded animals such as poultry and cattle, and are frequently detected in foods derived from these animals.
为了在严酷的冬季下生存，早在19世纪后期西伯利亚和俄罗斯远东地区的居民开始搜寻啮齿类动物的食物储藏库。
To survive brutal winters, inhabitants of Siberia and the Russian Far East as recently as the late 19th century raided food stores-of rodents.
包括锌和铜在内的金属，是动物的食物的组成成分，所以标记它们在化石中的分布和含量，可以让我们了解1亿年前这种动物的饮食习惯。
Since metals, including zinc and copper, form part of many animals' diets, so mapping them in fossils could shed light on what the animals fed on 100 million years ago.
他们通常一起打猎，寻找任何他们能找到的食物，而不是驯养动物和种植作物。
They usually hunt together and forage whatever foods are available to them, instead of domesticating animals and planting crops.
这很奇怪，因为研究人员观察的各种实验室动物往往被给予大量食物，且让它们在闲暇时一点一点蚕食。
This is strange because the sorts of lab animals the researchers looked attend to be given lots of food and left to nibble at leisure.
如果你是从海外来的，不要带任何食物、动物或植物进入这个国家。
If you are arriving from overseas, bring no food, animal or plant material into the country.
食物短缺或过度捕猎都可能威胁到动物的数量。
Either food scarcity or excessive hunting can threaten a population of animals.
这是一项重要的发现，因为通过学习耕作土地，饲养动物，就可以有稳定的食物来源。
This was an important discovery, because by learning to cultivate the land, and care for animals, mankind would always have food steadily.
对于胃部较小的动物来说，不断寻找食物并消化的过程会消耗大量能量。
For animals with small stomachs, it takes lots of energy to constantly look for food and then digest it.
现在我们已经讨论了古代社会的人们是如何驯养像牛和鸡这样的动物，并把它们作为食物和用于其他用途的。
Now that we've discussed how people in ancient societies tamed animals like cows and chickens for food and other uses.
但是海洋中浮游动物每天的垂直运动——夜里上浮以寻找食物，白天下潜以躲避捕食者——也可以被视作迁徒。
But daily vertical movements by zooplankton in the ocean—upward by night to seek food, downward by day to escape predators—can also be considered migration.
后果是打断食物链，使许多动物和捕食它们的动物饿死。
The effect was to disrupt the food chain, starving many animals and those that preyed on them.
因此，牧民和广义的食肉动物一样，在食物链中地位更高。
As a result, pastoralists, like carnivores in general, occupy a higher position on the food chain.
它们通常很难觅食，所以一些动物会在冬天来临前收集额外的食物并储藏起来，例如老鼠。
It is often hard for them to find food, so some animals such as mice collect extra food before winter and hide it.
人类和野生动物都在不停地迁徙，以寻找食物和可靠的水源。
Both humans and animals were constantly on the move, in search of food and reliable water supplies.
为了在入冬前做好准备，这些动物会吃更多的食物来增肥，从而获取睡眠时所需的热量。
To prepare for this before winter, these animals eat extra food to become fat which gives them the energy they need while they sleep.
但现代动物有一种帮助消化食物的有趣的方法。
But modern animals have an interesting aid for digesting food.
食物的大部分价值在动物的消化和细胞替代过程中丧失了。
Much of the food value is lost in the animal's process of digestion and cell replacement.
游牧社会的流动性反映了他们对动物性食物的依赖。
The mobility of pastoralist societies reflects their dependence on animal-based foods.
事实上，有研究表明，以偷别人食物而闻名的鸦科动物会隐藏自己的食物，正是因为它们把自己偷东西的倾向投射到其他鸦类身上。
It's been suggested in fact that jays, corvids known for stealing each other's food, may hide their food precisely because they are projecting their own tendency to steal onto other jays.
鸦科动物和一些哺乳动物有未雨绸缪的能力，比如把食物储存在它们以后能找到的地方。
Corvids and some mammals have the ability to plan for the future, to store food for instance, in places where they can find it later.
自1975年以来，提倡人道对待动物的人拓宽了他们的目标——反对用动物来获取毛皮、皮革、毛织物和食物。
Since 1975 advocates of humane treatment of animals have broadened their goals to oppose the use of animals for fur, leather, wool and food.
比如说，像大象这样的大型动物比小型动物需要更多的食物和能量，而其后代比小型动物更少。
Large animals like elephants, say, they require much more food and energy and have fewer offspring than smaller animals.
所以冰河世纪的动物能够吃到不同的植物，不同的食物。
So Ice Age animals had access to many different types of plants, different types of food.
所以冰河世纪的动物能够吃到不同的植物，不同的食物。
So Ice Age animals had access to many different types of plants, different types of food.
应用推荐