Mammals are vertebrates, such as birds, reptiles, amphibians or fish.
Mammals can live on land (dogs, cats and cows are mammals) or in water (dolphins and whales are mammals). Mammals that live on lands have four legs and they have hair too.
Mammals give birth to live young and mammal mother's nurse their young with milk.
Mammals have lungs and need air to breathe.
Look at this video
Video: learn more about mammals (click here).
Memory game: mammals (click here).
