The zebra is a mammal
Hamsters, mice and guinea pigs are mammals too. And so are you.
Maybe you have seen a cow feeding a calf. He drinks milk from his mother's body. Of all the animals, only mammals do this.
Mammals are warm-blooded. The day can be icy or very hot, but the body of mammals always remains at the same temperature, at all times.
Mammals have dense fur or sparse hair on their bodies. Hair can be long or short, straight or curly, soft or hard. There may be many or only a few thick and tough hairs.
The cougar is a mammal
There is more of 700.000 kinds of insects and more than 20.000 kinds of fish. There are only a few 5.000 kinds of mammals. But of all the animals, mammals are chosen to be with man or help him.