That is because human beings are mammals.

Bats are mammals, just like us.

A whale is no less a mammal than a horse.

Human beings are the higher mammals.

In fact, to move at any speed the polar bear uses twice as much energy as do most other mammals.

A whale is a mammal; in other words it feeds milk to its young.

The whale is well known to be the largest mammal.

The whale is not a fish but a mammal.

Whales come under mammals.

A whale is a sort of mammal.