Because whales live in the ocean, many people think they are fish. Did do you know that whales and dolphins are not fish? They are mammals. People are mammals too.
Mammals are the group of animals that breath air using lungs, give birth to live young (rather than laying eggs), and feed their young with mother’s milk.
All animals, including people, need oxygen, a chemical found in both the air and in water.
Fish use their gills to take oxygen from the water that they live in.
But people get the oxygen we need by breathing air, using our lungs.
Whales and dolphins use their lungs to breathe air also.