食肉动物通常是有着复杂的社会关系的哺乳动物。
有人提出哺乳动物是在6 500万年前取代恐龙的。
It has been suggested that mammals took over from dinosaurs 65 million years ago.
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。
Humans experience a delayed maturity; we arrive at all stages of life later than other mammals.
恐龙、昆虫和哺乳动物飞上了天空。
蟒主要吃鸟和小的哺乳动物。
猫、狗和猴子都是哺乳动物。
猴子和狗都是哺乳动物。
骆驼是一种哺乳动物，但是几维鸟是一种鸟。
鲸鱼是哺乳动物。
我们知道像狗这样的哺乳动物会发出很多不同的声音。
We know that mammals, dogs for example, dogs vocalize many different sounds.
与许多哺乳动物不同的是，它们不会做出类似人类的行为。
Unlike many mammals they do not engage in human-like behaviour.
蝙蝠是唯一能飞很远的哺乳动物，但它们还有另一种能力。
Bats are the only mammals that can fly a great distance, but they have another ability.
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。
You probably remember that human infants are less developed physically than other mammals of the same age.
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。
Some of those small mammals help to sustain such big birds as golden eagles.
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。
For thousands of years they have had to rely on catching sea mammals and fish as a means of sustenance.
你在哺乳动物身上找不到羽毛，在灵长类动物身上找不到腮。
You won't ever find feathers on a mammal or gills on a primate.
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。
These same sensations also cause mammals to develop various types of social relations and kinship networks.
唯一明确的解释是人类的过度捕猎导致了各种哺乳动物的灭绝。
The only clear explanation is that humans caused the extinction of the various mammal species through excessive hunting.
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。
In last week's lecture, we discussed the characteristics of the newly born offspring of several mammals.
会走路的哺乳动物和会游泳的鲸鱼之间的差异是如何衔接起来的？
How was the gap between a walking mammal and a swimming whale bridged?
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。
Pakicetus probably detected sound through the ear opening as in land mammals.
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。
The ear area of its skull had characteristics seen only in aquatic mammals, specifically whales.
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。
Human numerical instincts are not so superior to those of other mammals as is generally believed.
在所有哺乳动物物种中，只有不到5%的雄性承担父母养育的责任。
Males contribute to parental care in fewer than five percent of all mammalian species.
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。
It is probable that the nocturnal trades a way back in the ancestry of all mammals.
许多哺乳动物的奶含有大麻素，这种物质可以刺激大脑中的某些受体。
The milk of many mammals contains cannabinoids, substances that are known to stimulate certain receptors in the brain.
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。
Compared with other mammals, our numerical instincts are not as remarkable as many assume.
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。
Humans first settled in the Arctic a mere 4,500 years ago, surviving by exploiting sea mammals and fish.
例如，如果没有恐龙的灭绝，我们这些哺乳动物就不会有机会繁荣昌盛。
For instance, if it hadn't been for the extinction of the dinosaurs, we mammals would never have had an opportunity to flourish.
数量的周期循环是小型哺乳动物的特征，它们有时似乎是由捕食者造成的。
Population cycles are characteristic of small mammals, and they sometimes appear to be brought about by predators.
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