All mammals have hair.

We humans are hairy mammals.

Mammals also have lungs and breathe air.

But surprisingly not all mammals live on land.

Whales are air breathing, hairy mammals which live in the sea.

Even dolphins are mammals with hair.

Mammals have either no legs, or four legs.

Some have special front legs called arms.

And feet called hands.

Mammals are all warm blooded.

Which means, whatever the temperature is outside, they keep the same body temperature inside.

And all mammals have live babies.