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Mammals
哺乳动物
What animals can produce milk for their babies? Mammals.
什么动物能为它们的宝宝产奶?哺乳动物。
Dogs, pigs, elephants, lions, dolphins and bats are examples of mammals.
猪，狗，大象，狮子，海豚和蝙蝠都是哺乳动物。
Humans are also a kind of mammal.
人类也是一种哺乳动物。
Female mammals have a specialized organ that makes milk.
雌性哺乳动物有一种专门的器官能产奶。
There are over 4200 species of mammals.
哺乳动物有4200多种。
The largest mammals are blue whales.
最大的哺乳动物是蓝鲸。
They are up to 33 meters long and weigh over 170 tons.
它们体长33米，重170多吨。
The bumble bee bats are known to be the smallest mammals.
大黄蜂蝙蝠被公认是最小的哺乳动物。
They weigh less than 2 grams, so they are lighter than a coin.
它们的体重不到2克，比一枚硬币还轻。
