Carnivores are usually socially complex mammals.
食肉动物通常是有着复杂的社会关系的哺乳动物。
It has been suggested that mammals took over from dinosaurs 65 million years ago.
有人提出哺乳动物是在6 500万年前取代恐龙的。
Humans experience a delayed maturity; we arrive at all stages of life later than other mammals.
人类经历着一个迟来的成熟；我们进入生命各个阶段的时间比其他哺乳动物要晚。
猴子和狗都是哺乳动物。
Cats, dogs, and monkeys are some mammals.
猫、狗和猴子都是哺乳动物。
Pythons mainly feed on birds and small mammals.
蟒主要吃鸟和小的哺乳动物。
Some examples of mammals are man, pigs, and dogs.
哺乳类动物的例子有人类，猪和狗。
Unlike many mammals they do not engage in human-like behaviour.
与许多哺乳动物不同的是，它们不会做出类似人类的行为。
We know that mammals, dogs for example, dogs vocalize many different sounds.
我们知道像狗这样的哺乳动物会发出很多不同的声音。
Some of those small mammals help to sustain such big birds as golden eagles.
其中的一些小型哺乳动物有助于维持金鹰等大型鸟类的生存。
Pakicetus probably detected sound through the ear opening as in land mammals.
巴基鲸可能是通过像陆地哺乳动物一样的耳朵的开口来探测声音。
In that sense, they are closer to mammals' brains than other reptiles' brains.
从那种意义上来说，比起其他爬行动物的大脑它们更接近哺乳动物的大脑。
It is probable that the nocturnal trades a way back in the ancestry of all mammals.
这种夜间的“交易”也许可以一直追溯到所有哺乳动物的祖先身上。
Seasonal migration is another form of escape, especially for large mammals or birds.
季节性迁徙是另一种逃避方式，特别是对大型哺乳动物或鸟类来说尤为如此。
Bats are the only mammals that can fly a great distance, but they have another ability.
蝙蝠是唯一能飞很远的哺乳动物，但它们还有另一种能力。
Compared with other mammals, our numerical instincts are not as remarkable as many assume.
与其他哺乳动物相比，我们的数学天赋并不像许多人认为的那样非凡。
It also had a long thin tail, typical of mammals, something we don't see in today's whales.
它还有一条细长的尾巴，这是哺乳动物的典型特征，今天的鲸鱼没有保留这一特征。
The ear area of its skull had characteristics seen only in aquatic mammals, specifically whales.
它头骨的耳朵区域具有只有水生哺乳动物才有的特征，特别像鲸鱼。
Human numerical instincts are not so superior to those of other mammals as is generally believed.
人类对于数字的天赋并不像人们普遍认为的那样优于其他哺乳动物。
Long before Man lived on the Earth, there were fishes, reptiles, birds, insects, and some mammals.
在人类出现很早以前，地球上就出现了鱼类、爬虫类、鸟类和一些哺乳动物。
But when a new area is fueled by rain, the mammals migrate toward it in a set order to exploit it.
但当一个新的区域得到雨水的补给，哺乳动物就会按一定的顺序向它迁移以利用它。
For thousands of years they have had to rely on catching sea mammals and fish as a means of sustenance.
数千年来，它们不得不依靠捕食海中的哺乳动物和鱼类为生。
In last week's lecture, we discussed the characteristics of the newly born offspring of several mammals.
在上周的讲座中，我们讨论了几种哺乳动物新出生的后代的特征。
Humans first settled in the Arctic a mere 4,500 years ago, surviving by exploiting sea mammals and fish.
人类最早在4500年前定居在北极，靠捕捞海洋哺乳动物和鱼类生存。
You probably remember that human infants are less developed physically than other mammals of the same age.
你可能还记得，同龄人类婴儿的身体发育不如其他哺乳动物。
These same sensations also cause mammals to develop various types of social relations and kinship networks.
这些相同的感觉也使哺乳动物发展出多种社会关系和亲属网络。
Other mammals, such as the platypus and some shrews, are venomous, meaning they produce a toxin internally .
其他哺乳动物如鸭嘴兽和一些鼩鼱是有毒的，这意味着它们会在体内产生一种毒素。
Missing until recently were fossils clearly intermediate, or transitional, between land mammals and cetaceans.
直到最近才发现的化石，显然是介于陆地哺乳动物和鲸类之间的过渡物种。
Large mammals once wandered the volcano slopes, but today, foxes, wild cats, rabbits and mice are more common.
大型哺乳动物曾经在火山山坡上漫步，但现在，狐狸、野猫、兔子和老鼠更常见了。
Large mammals once wandered the volcano slopes, but today, foxes, wild cats, rabbits, and mice are more common.
曾经在火山山坡上游荡的是大型哺乳动物，但现在，那儿更常见的是狐狸、野猫、兔子和老鼠。
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