As your science teacher has told you, mammals belong to a class of warm-blooded animals. They are vertebrate animals that are supported by back bones.
Mammals can be distinguished by having fur or hair on their bodies, and the secretion of milk. But with the exception of the platypus which give birth to a live young.
Examples of mammals include elephant, monkey, tiger, mouse, dog and human being. These are mammals that live on land.
Whales, dolphins and sea lions for example are mammals that live in the sea. Even though they live in the sea, they do not have gills like the fish. In fact, they use their lungs to breathe air.
As mentioned earlier, mammals have backbones. Since they are warm-blooded, their body is maintained at a steady temperature by an internal mechanism.
Female mammals generally secrete milk through their mammary glands around the time when they give birth to live young. For certain species, more than one live young are born at one time. The milk becomes the first food for the young mammal. When the young is big enough, it will take solid food.
Since mammals are warm-blooded, they are active in both cold and warm weather. But for some mammals like bears, they hibernate in winter.
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